Auto merge of #4146 - alexcrichton:bump, r=alexcrichton
authorbors <bors@rust-lang.org>
Thu, 8 Jun 2017 16:19:04 +0000 (16:19 +0000)
committerbors <bors@rust-lang.org>
Thu, 8 Jun 2017 16:19:04 +0000 (16:19 +0000)
Bump to 0.21.0

We're working on the next version now!


Trivial merge