Updates the headers and formatting

[fedefernandez]

Please @juanpedromoreno review. Thanks

[juanpedromoreno]

👍

[codecov-io]

Codecov Report

Merging #72 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #72   +/-   ##
=======================================
  Coverage   79.71%   79.71%           
=======================================
  Files          34       34           
  Lines         483      483           
  Branches        2        2           
=======================================
  Hits          385      385           
  Misses         98       98

Impacted Files	Coverage Δ
...red/src/main/scala/github4s/api/PullRequests.scala	100% <ø> (ø)	⬆️
...n/scala/github4s/free/algebra/PullRequestOps.scala	100% <ø> (ø)	⬆️
.../main/scala/github4s/free/domain/PullRequest.scala	100% <ø> (ø)	⬆️

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