Set the correct MagicPython package dependency

[fed]

After installing Nuclide I've set it to automatically fetch and install all recommended packages. However, I've had this alert popping up every single time I opened Nuclide:

It looked like the MagicPython package was getting installed, but it actually wasn't (btw I'm running Atom 1.23.1, Nuclide 0.273.0 on MacOS High Sierra).

Tried installing it manually running apm install MagicPython but it errored out:

Installing MagicPython to /Users/fknussel/.atom/packages ✓
fs.js:640
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
                 ^

Error: ENOENT: no such file or directory, open '/Users/fknussel/.atom/packages/MagicPython/package.json'
    at Error (native)
    at Object.fs.openSync (fs.js:640:18)
    at Proxy.fs.readFileSync (fs.js:508:33)
    at Proxy.fs.readFileSync (/private/var/folders/4j/6cfp1zxj6_x9ywq8g_nj3b8m0000gn/T/AppTranslocation/4FCD6043-6D3C-464A-B0B9-FF1FCD713E7C/d/Atom.app/Contents/Resources/app/apm/node_modules/asar-require/lib/require.js:86:27)
    at /private/var/folders/4j/6cfp1zxj6_x9ywq8g_nj3b8m0000gn/T/AppTranslocation/4FCD6043-6D3C-464A-B0B9-FF1FCD713E7C/d/Atom.app/Contents/Resources/app/apm/lib/install.js:476:42
    at fn (/private/var/folders/4j/6cfp1zxj6_x9ywq8g_nj3b8m0000gn/T/AppTranslocation/4FCD6043-6D3C-464A-B0B9-FF1FCD713E7C/d/Atom.app/Contents/Resources/app/apm/node_modules/async/lib/async.js:582:34)
    at Immediate.<anonymous> (/private/var/folders/4j/6cfp1zxj6_x9ywq8g_nj3b8m0000gn/T/AppTranslocation/4FCD6043-6D3C-464A-B0B9-FF1FCD713E7C/d/Atom.app/Contents/Resources/app/apm/node_modules/async/lib/async.js:498:34)
    at runCallback (timers.js:649:20)
    at tryOnImmediate (timers.js:622:5)
    at processImmediate [as _immediateCallback] (timers.js:594:5)

Not sure what's the deal with case sensitivity when it comes to Atom packages, but switching to the lowercase name version (as per the package site) seemed to do the trick:

apm install magicpython

Never got the "installing MagicPython" alert message again on boot up.

Not sure this is just me, but anyway I reckon this should be changed to reflect the actual name of the package.

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