Auto merge of #4338 - GuillaumeGomez:lint, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 28 Jul 2017 22:40:15 +0000 (22:40 +0000)
committerbors <bors@rust-lang.org>
Fri, 28 Jul 2017 22:40:15 +0000 (22:40 +0000)
Update to rc error chain

In order to make https://github.com/rust-lang/rust/pull/43009 works, I needed some small updates that are now in error-chain.


Trivial merge