Auto merge of #4872 - MaloJaffre:flate-1.0, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 29 Dec 2017 16:18:31 +0000 (16:18 +0000)
committerbors <bors@rust-lang.org>
Fri, 29 Dec 2017 16:18:31 +0000 (16:18 +0000)
Upgrade flate2 crate to 1.0

Unblocks rust-lang/rust#46278.


Trivial merge