add linebreak

append line break to  the command output

```
lizhiye@localhost:✍  bower lookup angular-disqus
angular-disqus git://github.com/kirstein/angular-disqus.gitlizhiye@localhost: ✍
```

It should act like below:
```
lizhiye@localhost:  bower lookup angular-disqus
angular-disqus git://github.com/kirstein/angular-disqus.git
lizhiye@localhost: ✍
```

cc @sindresorhus