Log Message:
Pytest 3.1.1 (2017-05-30)
Bug Fixes
* pytest warning capture no longer overrides existing warning filters. The \ 
previous behaviour would override all filters and caused regressions in test \ 
suites which configure warning filters to match their needs. Note that as a \ 
side-effect of this is that DeprecationWarning and PendingDeprecationWarning are \ 
no longer shown by default.
* Fix issue with non-ascii contents in doctest text files.
* Fix encoding errors for unicode warnings in Python 2.
* pytest.deprecated_call now captures PendingDeprecationWarning in context \ 
manager form.

Improved Documentation
* Addition of towncrier for changelog management.