diff --git a/Pipfile.lock b/Pipfile.lock
index 7766940..4f10853 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -16,19 +16,20 @@
         ]
     },
     "default": {
-        "appdirs": {
+        "backports.entry-points-selectable": {
             "hashes": [
-                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
-                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
+                "sha256:988468260ec1c196dab6ae1149260e2f5472c9110334e5d51adcb77867361f6a",
+                "sha256:a6d9a871cde5e15b4c4a53e3d43ba890cc6861ec1332c9c2428c92f977192acc"
             ],
-            "version": "==1.4.4"
+            "markers": "python_version >= '2.7'",
+            "version": "==1.1.0"
         },
         "certifi": {
             "hashes": [
-                "sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c",
-                "sha256:719a74fb9e33b9bd44cc7f3a8d94bc35e4049deebe19ba7d8e108280cfd59830"
+                "sha256:2bbf76fd432960138b3ef6dda3dde0544f27cbf8546c458e60baf371917ba9ee",
+                "sha256:50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8"
             ],
-            "version": "==2020.12.5"
+            "version": "==2021.5.30"
         },
         "cycler": {
             "hashes": [
@@ -39,10 +40,10 @@
         },
         "distlib": {
             "hashes": [
-                "sha256:8c09de2c67b3e7deef7184574fc060ab8a793e7adbb183d942c389c8b13c52fb",
-                "sha256:edf6116872c863e1aa9d5bb7cb5e05a022c519a4594dc703843343a9ddd9bff1"
+                "sha256:106fef6dc37dd8c0e2c0a60d3fca3e77460a48907f335fa28420463a6f799736",
+                "sha256:23e223426b28491b1ced97dc3bbe183027419dfc7982b4fa2f05d5f3ff10711c"
             ],
-            "version": "==0.3.1"
+            "version": "==0.3.2"
         },
         "filelock": {
             "hashes": [
@@ -53,41 +54,53 @@
         },
         "kiwisolver": {
             "hashes": [
-                "sha256:0cd53f403202159b44528498de18f9285b04482bab2a6fc3f5dd8dbb9352e30d",
-                "sha256:1e1bc12fb773a7b2ffdeb8380609f4f8064777877b2225dec3da711b421fda31",
-                "sha256:225e2e18f271e0ed8157d7f4518ffbf99b9450fca398d561eb5c4a87d0986dd9",
-                "sha256:232c9e11fd7ac3a470d65cd67e4359eee155ec57e822e5220322d7b2ac84fbf0",
-                "sha256:31dfd2ac56edc0ff9ac295193eeaea1c0c923c0355bf948fbd99ed6018010b72",
-                "sha256:33449715e0101e4d34f64990352bce4095c8bf13bed1b390773fc0a7295967b3",
-                "sha256:401a2e9afa8588589775fe34fc22d918ae839aaaf0c0e96441c0fdbce6d8ebe6",
-                "sha256:44a62e24d9b01ba94ae7a4a6c3fb215dc4af1dde817e7498d901e229aaf50e4e",
-                "sha256:50af681a36b2a1dee1d3c169ade9fdc59207d3c31e522519181e12f1b3ba7000",
-                "sha256:563c649cfdef27d081c84e72a03b48ea9408c16657500c312575ae9d9f7bc1c3",
-                "sha256:5989db3b3b34b76c09253deeaf7fbc2707616f130e166996606c284395da3f18",
-                "sha256:5a7a7dbff17e66fac9142ae2ecafb719393aaee6a3768c9de2fd425c63b53e21",
-                "sha256:5c3e6455341008a054cccee8c5d24481bcfe1acdbc9add30aa95798e95c65621",
-                "sha256:5f6ccd3dd0b9739edcf407514016108e2280769c73a85b9e59aa390046dbf08b",
-                "sha256:72c99e39d005b793fb7d3d4e660aed6b6281b502e8c1eaf8ee8346023c8e03bc",
-                "sha256:78751b33595f7f9511952e7e60ce858c6d64db2e062afb325985ddbd34b5c131",
-                "sha256:834ee27348c4aefc20b479335fd422a2c69db55f7d9ab61721ac8cd83eb78882",
-                "sha256:8be8d84b7d4f2ba4ffff3665bcd0211318aa632395a1a41553250484a871d454",
-                "sha256:950a199911a8d94683a6b10321f9345d5a3a8433ec58b217ace979e18f16e248",
-                "sha256:a357fd4f15ee49b4a98b44ec23a34a95f1e00292a139d6015c11f55774ef10de",
-                "sha256:a53d27d0c2a0ebd07e395e56a1fbdf75ffedc4a05943daf472af163413ce9598",
-                "sha256:acef3d59d47dd85ecf909c359d0fd2c81ed33bdff70216d3956b463e12c38a54",
-                "sha256:b38694dcdac990a743aa654037ff1188c7a9801ac3ccc548d3341014bc5ca278",
-                "sha256:b9edd0110a77fc321ab090aaa1cfcaba1d8499850a12848b81be2222eab648f6",
-                "sha256:c08e95114951dc2090c4a630c2385bef681cacf12636fb0241accdc6b303fd81",
-                "sha256:c5518d51a0735b1e6cee1fdce66359f8d2b59c3ca85dc2b0813a8aa86818a030",
-                "sha256:c8fd0f1ae9d92b42854b2979024d7597685ce4ada367172ed7c09edf2cef9cb8",
-                "sha256:ca3820eb7f7faf7f0aa88de0e54681bddcb46e485beb844fcecbcd1c8bd01689",
-                "sha256:cf8b574c7b9aa060c62116d4181f3a1a4e821b2ec5cbfe3775809474113748d4",
-                "sha256:d3155d828dec1d43283bd24d3d3e0d9c7c350cdfcc0bd06c0ad1209c1bbc36d0",
-                "sha256:f8d6f8db88049a699817fd9178782867bf22283e3813064302ac59f61d95be05",
-                "sha256:fd34fbbfbc40628200730bc1febe30631347103fc8d3d4fa012c21ab9c11eca9"
+                "sha256:0007840186bacfaa0aba4466d5890334ea5938e0bb7e28078a0eb0e63b5b59d5",
+                "sha256:19554bd8d54cf41139f376753af1a644b63c9ca93f8f72009d50a2080f870f77",
+                "sha256:1d45d1c74f88b9f41062716c727f78f2a59a5476ecbe74956fafb423c5c87a76",
+                "sha256:1d819553730d3c2724582124aee8a03c846ec4362ded1034c16fb3ef309264e6",
+                "sha256:2210f28778c7d2ee13f3c2a20a3a22db889e75f4ec13a21072eabb5693801e84",
+                "sha256:22521219ca739654a296eea6d4367703558fba16f98688bd8ce65abff36eaa84",
+                "sha256:25405f88a37c5f5bcba01c6e350086d65e7465fd1caaf986333d2a045045a223",
+                "sha256:2b65bd35f3e06a47b5c30ea99e0c2b88f72c6476eedaf8cfbc8e66adb5479dcf",
+                "sha256:2ddb500a2808c100e72c075cbb00bf32e62763c82b6a882d403f01a119e3f402",
+                "sha256:2f8f6c8f4f1cff93ca5058d6ec5f0efda922ecb3f4c5fb76181f327decff98b8",
+                "sha256:30fa008c172355c7768159983a7270cb23838c4d7db73d6c0f6b60dde0d432c6",
+                "sha256:3dbb3cea20b4af4f49f84cffaf45dd5f88e8594d18568e0225e6ad9dec0e7967",
+                "sha256:4116ba9a58109ed5e4cb315bdcbff9838f3159d099ba5259c7c7fb77f8537492",
+                "sha256:44e6adf67577dbdfa2d9f06db9fbc5639afefdb5bf2b4dfec25c3a7fbc619536",
+                "sha256:5326ddfacbe51abf9469fe668944bc2e399181a2158cb5d45e1d40856b2a0589",
+                "sha256:70adc3658138bc77a36ce769f5f183169bc0a2906a4f61f09673f7181255ac9b",
+                "sha256:72be6ebb4e92520b9726d7146bc9c9b277513a57a38efcf66db0620aec0097e0",
+                "sha256:7843b1624d6ccca403a610d1277f7c28ad184c5aa88a1750c1a999754e65b439",
+                "sha256:7ba5a1041480c6e0a8b11a9544d53562abc2d19220bfa14133e0cdd9967e97af",
+                "sha256:80efd202108c3a4150e042b269f7c78643420cc232a0a771743bb96b742f838f",
+                "sha256:82f49c5a79d3839bc8f38cb5f4bfc87e15f04cbafa5fbd12fb32c941cb529cfb",
+                "sha256:83d2c9db5dfc537d0171e32de160461230eb14663299b7e6d18ca6dca21e4977",
+                "sha256:8d93a1095f83e908fc253f2fb569c2711414c0bfd451cab580466465b235b470",
+                "sha256:8dc3d842fa41a33fe83d9f5c66c0cc1f28756530cd89944b63b072281e852031",
+                "sha256:9661a04ca3c950a8ac8c47f53cbc0b530bce1b52f516a1e87b7736fec24bfff0",
+                "sha256:a498bcd005e8a3fedd0022bb30ee0ad92728154a8798b703f394484452550507",
+                "sha256:a7a4cf5bbdc861987a7745aed7a536c6405256853c94abc9f3287c3fa401b174",
+                "sha256:b5074fb09429f2b7bc82b6fb4be8645dcbac14e592128beeff5461dcde0af09f",
+                "sha256:b6a5431940f28b6de123de42f0eb47b84a073ee3c3345dc109ad550a3307dd28",
+                "sha256:ba677bcaff9429fd1bf01648ad0901cea56c0d068df383d5f5856d88221fe75b",
+                "sha256:bcadb05c3d4794eb9eee1dddf1c24215c92fb7b55a80beae7a60530a91060560",
+                "sha256:bf7eb45d14fc036514c09554bf983f2a72323254912ed0c3c8e697b62c4c158f",
+                "sha256:c358721aebd40c243894298f685a19eb0491a5c3e0b923b9f887ef1193ddf829",
+                "sha256:c4550a359c5157aaf8507e6820d98682872b9100ce7607f8aa070b4b8af6c298",
+                "sha256:c6572c2dab23c86a14e82c245473d45b4c515314f1f859e92608dcafbd2f19b8",
+                "sha256:cba430db673c29376135e695c6e2501c44c256a81495da849e85d1793ee975ad",
+                "sha256:dedc71c8eb9c5096037766390172c34fb86ef048b8e8958b4e484b9e505d66bc",
+                "sha256:e6f5eb2f53fac7d408a45fbcdeda7224b1cfff64919d0f95473420a931347ae9",
+                "sha256:ec2eba188c1906b05b9b49ae55aae4efd8150c61ba450e6721f64620c50b59eb",
+                "sha256:ee040a7de8d295dbd261ef2d6d3192f13e2b08ec4a954de34a6fb8ff6422e24c",
+                "sha256:eedd3b59190885d1ebdf6c5e0ca56828beb1949b4dfe6e5d0256a461429ac386",
+                "sha256:f441422bb313ab25de7b3dbfd388e790eceb76ce01a18199ec4944b369017009",
+                "sha256:f8eb7b6716f5b50e9c06207a14172cf2de201e41912ebe732846c02c830455b9",
+                "sha256:fc4453705b81d03568d5b808ad8f09c77c47534f6ac2e72e733f9ca4714aa75c"
             ],
-            "markers": "python_version >= '3.6'",
-            "version": "==1.3.1"
+            "markers": "python_version >= '3.7'",
+            "version": "==1.3.2"
         },
         "matplotlib": {
             "hashes": [
@@ -152,57 +165,78 @@
         },
         "pbr": {
             "hashes": [
-                "sha256:5fad80b613c402d5b7df7bd84812548b2a61e9977387a80a5fc5c396492b13c9",
-                "sha256:b236cde0ac9a6aedd5e3c34517b423cd4fd97ef723849da6b0d2231142d89c00"
+                "sha256:42df03e7797b796625b1029c0400279c7c34fd7df24a7d7818a1abb5b38710dd",
+                "sha256:c68c661ac5cc81058ac94247278eeda6d2e6aecb3e227b0387c30d277e7ef8d4"
             ],
             "markers": "python_version >= '2.6'",
-            "version": "==5.5.1"
+            "version": "==5.6.0"
         },
         "pillow": {
             "hashes": [
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+                "sha256:a048dad5ed6ad1fad338c02c609b862dfaa921fcd065d747194a6805f91f2196",
+                "sha256:a1bd983c565f92779be456ece2479840ec39d386007cd4ae83382646293d681b",
+                "sha256:a66566f8a22561fc1a88dc87606c69b84fa9ce724f99522cf922c801ec68f5c1",
+                "sha256:bcb04ff12e79b28be6c9988f275e7ab69f01cc2ba319fb3114f87817bb7c74b6",
+                "sha256:bd24054aaf21e70a51e2a2a5ed1183560d3a69e6f9594a4bfe360a46f94eba83",
+                "sha256:be25cb93442c6d2f8702c599b51184bd3ccd83adebd08886b682173e09ef0c3f",
+                "sha256:c691b26283c3a31594683217d746f1dad59a7ae1d4cfc24626d7a064a11197d4",
+                "sha256:cc9d0dec711c914ed500f1d0d3822868760954dce98dfb0b7382a854aee55d19",
+                "sha256:ce2e5e04bb86da6187f96d7bab3f93a7877830981b37f0287dd6479e27a10341",
+                "sha256:ce651ca46d0202c302a535d3047c55a0131a720cf554a578fc1b8a2aff0e7d96",
+                "sha256:d0c8ebbfd439c37624db98f3877d9ed12c137cadd99dde2d2eae0dab0bbfc355",
+                "sha256:d675a876b295afa114ca8bf42d7f86b5fb1298e1b6bb9a24405a3f6c8338811c",
+                "sha256:dde3f3ed8d00c72631bc19cbfff8ad3b6215062a5eed402381ad365f82f0c18c",
+                "sha256:e5a31c07cea5edbaeb4bdba6f2b87db7d3dc0f446f379d907e51cc70ea375629",
+                "sha256:f514c2717012859ccb349c97862568fdc0479aad85b0270d6b5a6509dbc142e2",
+                "sha256:fc0db32f7223b094964e71729c0361f93db43664dd1ec86d3df217853cedda87",
+                "sha256:fd4fd83aa912d7b89b4b4a1580d30e2a4242f3936882a3f433586e5ab97ed0d5",
+                "sha256:feb5db446e96bfecfec078b943cc07744cc759893cef045aa8b8b6d6aaa8274e"
             ],
-            "markers": "python_version >= '3.6'",
-            "version": "==8.1.0"
+            "index": "pypi",
+            "version": "==8.3.2"
         },
         "pipenv": {
             "hashes": [
-                "sha256:4ab2f60742184d851ac44b9e1d423afe71dc2ea7a68bde07eb890c8b4ce5a420",
-                "sha256:8253fe6f9cfb3791a54da8a0571f73c918cb3457dd908684c1800a13a06ec4c1"
+                "sha256:05958fadcd70b2de6a27542fcd2bd72dd5c59c6d35307fdac3e06361fb06e30e",
+                "sha256:d180f5be4775c552fd5e69ae18a9d6099d9dafb462efe54f11c72cb5f4d5e977"
             ],
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==2020.11.15"
+            "version": "==2021.5.29"
         },
         "pipenv-to-requirements": {
             "hashes": [
@@ -212,6 +246,14 @@
             "index": "pypi",
             "version": "==0.9.0"
         },
+        "platformdirs": {
+            "hashes": [
+                "sha256:15b056538719b1c94bdaccb29e5f81879c7f7f0f4a153f46086d155dffcd4f0f",
+                "sha256:8003ac87717ae2c7ee1ea5a84a1a61e87f3fbd16eb5aadba194ea30a9019f648"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==2.3.0"
+        },
         "pyparsing": {
             "hashes": [
                 "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1",
@@ -222,35 +264,35 @@
         },
         "python-dateutil": {
             "hashes": [
-                "sha256:73ebfe9dbf22e832286dafa60473e4cd239f8592f699aa5adaf10050e6e1823c",
-                "sha256:75bb3f31ea686f1197762692a9ee6a7550b59fc6ca3a1f4b5d7e32fb98e2da2a"
+                "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86",
+                "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"
             ],
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==2.8.1"
+            "version": "==2.8.2"
         },
         "six": {
             "hashes": [
-                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
-                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==1.15.0"
+            "version": "==1.16.0"
         },
         "virtualenv": {
             "hashes": [
-                "sha256:147b43894e51dd6bba882cf9c282447f780e2251cd35172403745fc381a0a80d",
-                "sha256:2be72df684b74df0ea47679a7df93fd0e04e72520022c57b479d8f881485dbe3"
+                "sha256:9ef4e8ee4710826e98ff3075c9a4739e2cb1040de6a2a8d35db0055840dc96a0",
+                "sha256:e4670891b3a03eb071748c569a87cceaefbf643c5bac46d996c5a45c34aa0f06"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==20.4.2"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==20.7.2"
         },
         "virtualenv-clone": {
             "hashes": [
-                "sha256:07e74418b7cc64f4fda987bf5bc71ebd59af27a7bc9e8a8ee9fd54b1f2390a27",
-                "sha256:665e48dd54c84b98b71a657acb49104c54e7652bce9c1c4f6c6976ed4c827a29"
+                "sha256:418ee935c36152f8f153c79824bb93eaf6f0f7984bae31d3f48f350b9183501a",
+                "sha256:44d5263bceed0bac3e1424d64f798095233b64def1c5689afa43dc3223caf5b0"
             ],
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==0.5.4"
+            "version": "==0.5.7"
         },
         "xlsxwriter": {
             "hashes": [
diff --git a/requirements.txt b/requirements.txt
index 0232640..3e5b11d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,30 +1,27 @@
-################################################################################
-# This requirements file has been automatically generated from `Pipfile` with
-# `pipenv-to-requirements`
 #
+# These requirements were autogenerated by pipenv
+# To regenerate from the project's Pipfile, run:
 #
-# This has been done to maintain backward compatibility with tools and services
-# that do not support `Pipfile` yet.
+#    pipenv lock --requirements
 #
-# Do NOT edit it directly, use `pipenv install [-d]` to modify `Pipfile` and
-# `Pipfile.lock` and then regenerate `requirements*.txt`.
-################################################################################
 
-appdirs==1.4.4
-certifi==2020.12.5
+-i https://pypi.org/simple/
+backports.entry-points-selectable==1.1.0; python_version >= '2.7'
+certifi==2021.5.30
 cycler==0.10.0
-distlib==0.3.1
+distlib==0.3.2
 filelock==3.0.12
-kiwisolver==1.3.1 ; python_version >= '3.6'
+kiwisolver==1.3.2; python_version >= '3.7'
 matplotlib==3.3.4
 numpy==1.20.1
-pbr==5.5.1 ; python_version >= '2.6'
-pillow==8.1.0 ; python_version >= '3.6'
+pbr==5.6.0; python_version >= '2.6'
+pillow==8.3.2
 pipenv-to-requirements==0.9.0
-pipenv==2020.11.15 ; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
-pyparsing==2.4.7 ; python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'
-python-dateutil==2.8.1 ; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
-six==1.15.0 ; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
-virtualenv-clone==0.5.4 ; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
-virtualenv==20.4.2 ; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+pipenv==2021.5.29; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+platformdirs==2.3.0; python_version >= '3.6'
+pyparsing==2.4.7; python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'
+python-dateutil==2.8.2; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+six==1.16.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+virtualenv-clone==0.5.7; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
+virtualenv==20.7.2; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
 xlsxwriter==1.3.7