Add release workflow

[blakeembrey]

Same as jshttp/content-disposition#143.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (08dc7a9) to head (f0abfc2).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #113   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           89        89           
  Branches        39        39           
=========================================
  Hits            89        89           

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