Update pytest to 5.1.3

[pyup-bot]

This PR updates pytest from 5.1.2 to 5.1.3.

Changelog

5.1.3

=========================

Bug Fixes
---------

- `5807 <https://github.com/pytest-dev/pytest/issues/5807>`_: Fix pypy3.6 (nightly) on windows.


- `5811 <https://github.com/pytest-dev/pytest/issues/5811>`_: Handle ``--fulltrace`` correctly with ``pytest.raises``.


- `5819 <https://github.com/pytest-dev/pytest/issues/5819>`_: Windows: Fix regression with conftest whose qualified name contains uppercase
characters (introduced by 5792).

Links

• PyPI: https://pypi.org/project/pytest
• Changelog: https://pyup.io/changelogs/pytest/
• Homepage: https://docs.pytest.org/en/latest/