Migrate to pyproject.toml

[drhagen]

• Specify build-system in pyproject.toml
• Move coverage configuration to pyproject.toml

[codecov-commenter]

Codecov Report

Merging #13 (6565154) into master (6234505) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master      #13   +/-   ##
=======================================
  Coverage   89.68%   89.68%           
=======================================
  Files          10       10           
  Lines         756      756           
  Branches      171      171           
=======================================
  Hits          678      678           
  Misses         39       39           
  Partials       39       39           

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