Auto merge of #5230 - matthiaskrgr:newline, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 23 Mar 2018 02:25:08 +0000 (02:25 +0000)
committerbors <bors@rust-lang.org>
Fri, 23 Mar 2018 02:25:08 +0000 (02:25 +0000)
add final linebreak to cargo default help message.

before:
![cargo_before](https://user-images.githubusercontent.com/476013/37807125-16809ec8-2e44-11e8-9606-f37c1a97caf2.png)
patch:
![cargo_after](https://user-images.githubusercontent.com/476013/37807134-227b658c-2e44-11e8-8f4b-d430414e69dc.png)

I assume this is some kind of leftover from the clap transition. cc @matklad


Trivial merge