Fixed cloning support on py3.5.
@@ -129,7 +129,7 @@ class EnvBuilder(venv.EnvBuilder):
"""
assert self._context is None
- super().create(env_dir)
+ super().create(str(env_dir))
# A bit if a hack. We remember the context seen in a call to
# `post_setup()` and return it here.
