Log Message:
py-confuse: updated to 2.0.1

v2.0.1
- Remove a `<4` Python version requirement bound.

v2.0.0
- Drop support for versions of Python below 3.6.

v1.7.0
- Add support for reading configuration values from environment variables
  (see `EnvSource`).
- Resolve a possible race condition when creating configuration directories.