Pypi actions

[marksweb]

This adds 2 github actions.

One will test PRs against test.pypi.org

The second, actually creates releases to pypi.org when we publish a release in the repo.

A much simpler pypi release process!

[codecov-commenter]

Codecov Report

Merging #110 (b1d7ab9) into master (80374d2) will not change coverage.
The diff coverage is n/a.

❗ Current head b1d7ab9 differs from pull request most recent head b147cf4. Consider uploading reports for the commit b147cf4 to get more accurate results

@@           Coverage Diff           @@
##           master     #110   +/-   ##
=======================================
  Coverage   96.71%   96.71%           
=======================================
  Files           6        6           
  Lines         213      213           
  Branches       44       44           
=======================================
  Hits          206      206           
  Misses          4        4           
  Partials        3        3           

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