Bump pytest from 3.2.2 to 3.3.1
Bump pytest from 3.2.2 to 3.3.1

Bumps [pytest](https://github.com/pytest-dev/pytest) from 3.2.2 to 3.3.1.
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/3.2.2...3.3.1)
wemake-services/wemake-django-template,wemake-services/wemake-django-template