Minor formatting fix for argparse

I assume formatting for the argparse help output got tweaked when PEP8-ing.

### Before:

```
  --list-types          List available issue types. Specify aproject ID to get
                        specific types for thatproject
```

### After:

```
  --list-types          List available issue types. Specify a project ID to
                        get specific types for that project
```

It's the little things that drive me cray.