Log Message:
py-aniso8601: updated to 8.1.1

Changes 8.1.1:

Deprecate running tests with python setup.py tests as the test suite support in \ 
Setuptools is deprecated
Add version to __init__.py
Cleaner reading of README.rst into the long_description field of setup.py
Define long_description_content_type as text/x-rst
Simplify Sphinx configuration
Add compat.is_string method, returns True for str, unicode types, False otherwise