$ git changes
6459977 Update changelog
$ git changes --count
Traceback (most recent call last):
  File "/Users/marcus/Development/python/git-commands/bin/git-changes", line 192, in <module>
    main()
  File "/Users/marcus/Development/python/git-commands/bin/git-changes", line 187, in main
    result = func(**args)
  File "/Users/marcus/Development/python/git-commands/bin/commands/changes.py", line 114, in changes
    messages.info(len(log))
  File "/Users/marcus/Development/python/git-commands/bin/commands/utils/messages.py", line 52, in info
    _print(message, quiet=quiet)
  File "/Users/marcus/Development/python/git-commands/bin/commands/utils/messages.py", line 8, in _print
    assert isinstance(message, str), "message must be a str"
AssertionError: message must be a str