Exception when constructing a Repo() from a pathlib.Path

[altendky]

Traceback (most recent call last):
  File "venv/bin/gridtied", line 11, in <module>
    load_entry_point('gridtied', 'console_scripts', 'gridtied')()
  File "/home/epc/g/20/grid-tied/venv/lib/python3.6/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/home/epc/g/20/grid-tied/venv/lib/python3.6/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/home/epc/g/20/grid-tied/venv/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/epc/g/20/grid-tied/venv/lib/python3.6/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/epc/g/20/grid-tied/venv/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/epc/g/20/grid-tied/python/gridtied/package.py", line 59, in cli
    commit(),
  File "/home/epc/g/20/grid-tied/python/gridtied/package.py", line 35, in commit
    repo = git.Repo(gridtied.project_root)
  File "/home/epc/g/20/grid-tied/venv/lib/python3.6/site-packages/git/repo/base.py", line 119, in __init__
    if expand_vars and ("%" in epath or "$" in epath):
TypeError: argument of type 'PosixPath' is not iterable

https://github.com/gitpython-developers/GitPython/blob/master/git/repo/base.py#L119