===================
Bug fix release
Fix
---
- Fix 9: Change the project's configuration: reinforce the constraint to the Wrapt requirement.
Other
-----
- Upgrade project configuration (``setup.py``) to add the *project_urls* property:
Documentation, Source and Bug Tracker URLs.
- Change the Tox configuration to test the library against different Wrapt versions.
- Fix an issue with the AppVeyor build: upgrade setuptools version in ``appveyor.yml``,
change the Tox configuration: set ``py27,py34,py35: pip >= 9.0.3, < 19.2``.