This test fails for me:

```
======================================================================
FAIL: test_is_contained (ployst.github.test.test_git_adapter.TestPythonGitAdapter)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/carles/dev/mine/ployst/ployst/github/test/test_git_adapter.py", line 39, in test_is_contained
    'my/feature-99'))
AssertionError: False is not true
```