Convert extras names to lowercase

[ryan-copperleaf]

Description

Converts the extra names in the package's extras_require to lowercase, working around pypa/pip#4617.

Motivation and Context

For example, even with the latest pip, pip install django-setup-tools[SMS] will not install twilio, even though it should.

How Has This Been Tested?

Tested by installing .[sms], and by confirming that installing .[SMS] continues to do what it did before.

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation. (Only phonenumbers and phonenumberslite seem to be mentioned, which are already lowercase.)
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #342 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #342   +/-   ##
=======================================
  Coverage   96.70%   96.70%           
=======================================
  Files          39       39           
  Lines        1669     1669           
  Branches      114      114           
=======================================
  Hits         1614     1614           
  Misses         34       34           
  Partials       21       21           

---

Continue to review full report at Codecov.

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[codecov]

Codecov Report

Merging #342 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #342   +/-   ##
=======================================
  Coverage   96.70%   96.70%           
=======================================
  Files          39       39           
  Lines        1669     1669           
  Branches      114      114           
=======================================
  Hits         1614     1614           
  Misses         34       34           
  Partials       21       21           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ccc11e7...6dc4166. Read the comment docs.

[moggers87]

Looks good to me!

I was going to moan about the lack of documentation, but it turns out we don't even document these 🤷‍♀️

[moggers87]

Just an FYI for those who are also affected by this: it seems like this is a wheel bug as specifying --no-binary :all: with pip or using easy_install solves the issue. Both of those methods treat extras_require keys in a case-insensitive way as expected (I tested this on pip 19.1.1 and easy_install from setuptools 41.2.0)