Add Version Increment Check Workflow

[ThomasGesseyJones]

Adds a GitHub workflow that automatically checks the version number has been incremented in a PR. It fails if the version has not been incremented appropriately. This PR also removes the duplicate specifications of version numbers by having setup.py read the version number from README.rst to avoid self-inconsistency issues.

This feature was requested in #52 .

Note: This PR should intentionally fail the version increment check initially as part of testing.

[AdamOrmondroyd]

Certainly seems to work, though I've personally never been a fan of writing def main() only to call that and nothing else under if __name__ == "__main__", though that might just be trauma from Java

otherwise lgtm

[htjb]

Looks good @ThomasGesseyJones! Just one query about the get_version.py script.

@AdamOrmondroyd what is lgmt hahaa?

[AdamOrmondroyd]

@AdamOrmondroyd what is lgmt hahaa?

Looks good to me (one I've picked up from pandas PRs), though it seems to cause no end of confusion with you lot

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6dbc685) 82.35% compared to head (6130693) 82.35%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #53   +/-   ##
=======================================
  Coverage   82.35%   82.35%           
=======================================
  Files           5        5           
  Lines         578      578           
=======================================
  Hits          476      476           
  Misses        102      102           

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[ThomasGesseyJones]

I have removed get_version.py as it was unused.

I mistakenly copied it over alongside check_version.py from globalemu. The get_version.py script is used as part of automatic tagging workflows. It can be restored in the future if we decide to implement automatic tagging.

[htjb]

Awesome lgtm thanks @ThomasGesseyJones! Please go ahead and squash and merge