Add pre-commit hooks, update README.md

[alexreinking]

No description provided.

[codecov-commenter]

Codecov Report

Merging #6 (e1723bb) into master (2a97f3f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   98.89%   98.89%           
=======================================
  Files           8        8           
  Lines         271      271           
=======================================
  Hits          268      268           
  Misses          3        3           

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