add chris as contributor

[crew102]

As per discussion in #12

[codecov-io]

Codecov Report

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

@@           Coverage Diff           @@
##           master      #13   +/-   ##
=======================================
  Coverage   77.88%   77.88%           
=======================================
  Files           8        8           
  Lines         104      104           
=======================================
  Hits           81       81           
  Misses         23       23

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[sckott]

LGTM

gave you push access to repo. Early on I'd ask that you still do branching and PR's, but can push directly for smaller things.