Adding codecov for coverage reporting

[aaronpowell]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (test-refactor@e116290). Click here to learn what that means.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             test-refactor     #10   +/-   ##
===============================================
  Coverage                 ?   45.9%           
===============================================
  Files                    ?       4           
  Lines                    ?     281           
  Branches                 ?      33           
===============================================
  Hits                     ?     129           
  Misses                   ?     144           
  Partials                 ?       8

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