Merge branch 'es/contacts'

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