Auto merge of #3087 - carols10cents:test-instructions-in-readme, r=alexcrichton
authorbors <bors@rust-lang.org>
Tue, 13 Sep 2016 04:11:45 +0000 (21:11 -0700)
committerGitHub <noreply@github.com>
Tue, 13 Sep 2016 04:11:45 +0000 (21:11 -0700)
Document recommended way for running tests

Fixes #3084.


Trivial merge