Trying to bak up file throws error

Doing `bak anyfile` throws
```
Traceback (most recent call last):
  File "/home/valence/.local/bin/bak", line 33, in <module>
    sys.exit(load_entry_point('bak==0.2.1a1', 'console_scripts', 'bak')())
  File "/home/valence/.local/bin/bak", line 25, in importlib_load_entry_point
    return next(matches).load()
StopIteration
```