Auto merge of #4386 - pornel:backups, r=alexcrichton
authorbors <bors@rust-lang.org>
Thu, 10 Aug 2017 05:11:28 +0000 (05:11 +0000)
committerbors <bors@rust-lang.org>
Thu, 10 Aug 2017 05:11:28 +0000 (05:11 +0000)
Exclude target directory from Time Machine

Fixes #3884


Trivial merge