Auto merge of #4826 - alexcrichton:silence-progress, r=matklad
authorbors <bors@rust-lang.org>
Sat, 16 Dec 2017 17:10:25 +0000 (17:10 +0000)
committerbors <bors@rust-lang.org>
Sat, 16 Dec 2017 17:10:25 +0000 (17:10 +0000)
Don't print a progress bar in quiet mode

Closes #4825


Trivial merge