Update github.com/maybebtc/logrus dependency

This patch was generated by running:

$ godep update github.com/maybebtc/logrus

Without this, `godep restore` fails like this:

```
$ LANG=C godep restore
fatal: reference is not a tree: 005463f8fb49c4a6f36181e05157e111ec5cf8a3
godep: restore: exit status 128
```

License: MIT
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>