A helper to read from a set of format-patch output files or a range
of commits and find those who may have insights to the code that
the changes touch by running a series of "git blame" commands.
* es/contacts:
contrib: contacts: add documentation
contrib: contacts: add mailmap support
contrib: contacts: interpret committish akin to format-patch
contrib: contacts: add ability to parse from committish
contrib: add git-contacts helper