GitHub: Blame Previous Commit Button

Add a button to `git blame` the `sha^` (parent commit) on each commit on a `git blame` page.

These are versions of this script where the code was updated. Show all versions.

  • v3 2016-06-08
  • v2 2016-06-08
  • v1 2015-06-28
  • v1 2015-06-28