Add Changes field to RepositoryEvent

[gmlewis]

Fixes: #2232 .

[gmlewis]

@ecrupper - please take a look and let me know what you think.

[codecov]

Codecov Report

Merging #2233 (0f786cc) into master (fef3638) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2233   +/-   ##
=======================================
  Coverage   97.81%   97.81%           
=======================================
  Files         112      112           
  Lines       10117    10117           
=======================================
  Hits         9896     9896           
  Misses        154      154           
  Partials       67       67           

Impacted Files	Coverage Δ
github/event_types.go	100.00% <ø> (ø)

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[ecrupper]

Pulled this down locally and applied it to my repo rename webhook logic and it worked like a charm! Thanks so much for this!

[gmlewis]

Thank you, @ecrupper !

Awaiting second LGTM before merging.
Note that any other repo contributor can review and approve this PR. Thanks!

[gmlewis]

Thank you, @pierce-m !
Merging.