fix(infrastructure): Print the entire invalid git commit message.

[shyndman]

Previously only the invalidate subject line would print, so if you'd written a big meaty comment that failed to validate you'd have to rewrite it.

[shyndman]

This happened to me. 😠

[codecov-io]

Codecov Report

Merging #510 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #510   +/-   ##
=======================================
  Coverage   99.02%   99.02%           
=======================================
  Files          45       45           
  Lines        2050     2050           
  Branches      251      251           
=======================================
  Hits         2030     2030           
  Misses         20       20

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[traviskaufman]

👍 LGTM. Skipping CI since it looks like failures were (obvious) false negatives.

Btw you can put in commit message bodies [ci skip] on changes that don't touch any code to have TravisCI skip it :)