Auto merge of #4572 - integer32llc:rust-1.21.0, r=alexcrichton
authorbors <bors@rust-lang.org>
Tue, 3 Oct 2017 20:13:17 +0000 (20:13 +0000)
committerbors <bors@rust-lang.org>
Tue, 3 Oct 2017 20:13:17 +0000 (20:13 +0000)
Backport of #4551 - owner-invite-messages

And *just* this change this time, I think :)

r? @alexcrichton


Trivial merge