Fix Bhutanese validations

lib/phony/countries.rb

@@ -1255,7 +1255,11 @@
           one_of(%w[92 97]) >> split(3) | # mobile
           fixed(2) >> split(3, 3)
 
-  country '975', fixed(1) >> split(3, 3) # Bhutan (Kingdom of) http://www.wtng.info/wtng-975-bt.html
+  # Bhutan (Kingdom of)
+  # https://en.wikipedia.org/wiki/Telephone_numbers_in_Bhutan
+  country '975',
+          one_of(%w(16 17 77)) >> split(3, 3) | # Mobile
+          one_of(%w(2)) >> split(3, 3) # Landline
 
   # Mongolia
   # https://www.numberingplans.com/?page=plans&sub=phonenr&alpha_2_input=MN

qed/plausibility.md

@@ -228,7 +228,18 @@ NDC with several subscriber number length.
 
 #### Bhutan
 
-    plausible? true: '+975 2 889 648'
+https://en.wikipedia.org/wiki/Telephone_numbers_in_Bhutan
+
+    Phony.assert.plausible?("+975 2 889 648") # Landline
+    Phony.assert.plausible?("+975 17 889 648") # B-Mobile
+    Phony.assert.plausible?("+975 16 889 648") # B-Mobile
+    Phony.assert.plausible?("+975 77 889 648") # TashiCell
+
+    Phony.refute.plausible?("+975 77 889 6489") # B-Mobile (too long)
+    Phony.refute.plausible?("+975 77 889 64") # B-Mobile (too short)
+    Phony.refute.plausible?("+975 3 889 648") # Not a landline
+    Phony.refute.plausible?("+975 2 889 64") # Landline too short
+    Phony.refute.plausible?("+975 2 889 6489") # Landline too long
 
 #### Bolivia
 

spec/lib/phony/countries_spec.rb

@@ -954,7 +954,10 @@ def self.it_splits(number, expected)
     end
 
     describe 'Bhutan (Kingdom of)' do
-      it_splits '9759723642', %w[975 9 723 642]
+      it_splits '9752972364', %w(975 2 972 364)
+      it_splits '97516297236', %w(975 16 297 236)
+      it_splits '97517297236', %w(975 17 297 236)
+      it_splits '97577297236', %w(975 77 297 236)
     end
 
     describe 'Brunei Darussalam' do