Bad output on 'git bug pull'

When running `git bug pull` on a repository that is already up-to-date, the `already up-to-date` message is displayed twice:

```
$ git bug pull
Fetching remote ...
already up-to-datealready up-to-date
Merging data ...
```

`git-bug version: 0.7.1-dev-d0db3b121b`