Prevent pip from installing the project on Python versions 3.5 and lower

[samkit-jain]

Result of #362, this PR enforces the Python version to be a minimum of 3.6 for pip to install the package.

Did some black formatting along the way as well.

[samkit-jain]

I wasn't sure if the PR required the changelog to be updated. @jsvine How do you build the package before publishing it to pip? I think we can include that as a build verification step to the GitHub Actions workflow.

[codecov[bot]]

Codecov Report

Merging #363 (8fa6eb0) into develop (a019517) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #363   +/-   ##
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  Coverage    98.25%   98.25%           
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  Files           10       10           
  Lines         1203     1203           
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  Hits          1182     1182           
  Misses          21       21           

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[jsvine]

Result of #362, this PR enforces the Python version to be a minimum of 3.6 for pip to install the package.

Thanks, and good idea! Merging.

I wasn't sure if the PR required the changelog to be updated.

I don't think it does, since we've already made clear that 3.5 support is deprecated, but thanks for asking.

@jsvine How do you build the package before publishing it to pip? I think we can include that as a build verification step to the GitHub Actions workflow.

python setup.py build sdist

Feel free to open a PR with that, or I can add it to my todo list.

[samkit-jain]

Feel free to open a PR with that, or I can add it to my todo list.

Opened PR #365