Log Message:
Chages 3.1.0:

New Features

* The ``pytest-warnings`` plugin has been integrated into the core, so now \ 
``pytest`` automatica
lly
  captures and displays warnings at the end of the test session.

* Added ``junit_suite_name`` ini option to specify root `<testsuite>` name \ 
for JUnit XML reports

* Added an ini option ``doctest_encoding`` to specify which encoding to use for \ 
doctest files.

* ``pytest.warns`` now checks for subclass relationship rather than
  class equality.

* ``pytest.raises`` now asserts that the error message matches a text or regex
  with the ``match`` keyword argument.

* ``pytest.param`` can be used to declare test parameter sets with marks and \ 
test ids.