Merge pull request #29 from irgeek/add-missing-types

Add some missing type annotations.

Merge pull request #28 from irgeek/fix-stubs-for-real

Really actually fix installing stubs with the package.

Merge pull request #27 from irgeek/fix-no-include-tests

Don't include 'tests' dir in package.

Update .gitignore.

Merge pull request #25 from igoose1/fix-stub-packaging

 Fix stub including in a package

Merge pull request #22 from ericbn/update-README.md

Update README.md

Update GH Actions config and remove Python 3.6

Pytest no longer supports Python 3.6 so it's getting very difficult to maintain tests
for that version. Python 3.6 went EOL about 12 months ago so there isn't much value in
continuing to support it.

Stop installing "tests" dir as a package.

Merge pull request #12 from treyhunner/patch-1

Correct Python version in enum.StrEnum note

Merge pull request #10 from irgeek/comparable

* Add a Comparable mix-in
* Add a MACRO_CASE StrEnum
* Add RTD documentation - https://strenum.readthedocs.io/en/latest/
* Drop Python 3.5 in tests