Auto merge of #4274 - sfackler:patch-1, r=alexcrichton
authorbors <bors@rust-lang.org>
Wed, 12 Jul 2017 17:26:25 +0000 (17:26 +0000)
committerbors <bors@rust-lang.org>
Wed, 12 Jul 2017 17:26:25 +0000 (17:26 +0000)
Add CircleCI badge to manifest reference

rust-lang/crates.io#807


Trivial merge