Add scala-pet-store to repos list

[zakpatterson]

Thank you!

[codecov]

Codecov Report

Merging #219 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #219   +/-   ##
=======================================
  Coverage   41.98%   41.98%           
=======================================
  Files          55       55           
  Lines         605      605           
  Branches       22       22           
=======================================
  Hits          254      254           
  Misses        351      351

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