Merge branch 'ls/github'
authorJunio C Hamano <gitster@pobox.com>
Thu, 22 Jun 2017 21:15:24 +0000 (14:15 -0700)
committerJunio C Hamano <gitster@pobox.com>
Thu, 22 Jun 2017 21:15:24 +0000 (14:15 -0700)
Help contributors that visit us at GitHub.

* ls/github:
Configure Git contribution guidelines for github.com

Trivial merge