$ git ubuntu lint
08/14/2017 15:12:37 - WARNING:Detached HEAD, assuming no namespace for tags. Pass --lint-namespace if this is incorrect.
Traceback (most recent call last):
  File "/snap/git-ubuntu/130/bin/git-ubuntu", line 18, in <module>
    main()
  File "/snap/git-ubuntu/130/gitubuntu/__main__.py", line 213, in main
    args.func(args)
  File "/snap/git-ubuntu/130/gitubuntu/lint.py", line 710, in main
    commitish_string
  File "/snap/git-ubuntu/130/gitubuntu/git_repository.py", line 780, in get_changelog_srcpkg_from_treeish
    return self.get_changelog_from_treeish(treeish).srcpkg
NameError: name 'treeish' is not defined