Log Message:
py-requests-mock: updated to 1.6.0

1.6.0
* Fix PEP8 failure in test\_adapter
* Respect user provided content encoding type
* Update minimum requests version to 2.3
* Added support for purl
* Add testing for Python 3.7 & PyPy3
* Drop \_matcher from request pickled state
* Clarify the pytest configuration documentation
* Update mocker.rst