[elixir/f19] (4 commits) ...upstream 0.12.5

[Ricky Elrod]

Summary of changes:

4220078... Latest release (*)
  bef6baf... 0.12.4 release (*)
  b68770a... add a convenience script for maintainers (*)
  c9dbffc... upstream 0.12.5 (*)

(*) This commit already existed in another branch; no separate mail sent