Bump pytest from 5.3.2 to 5.3.4 (#1184)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.3.2 to 5.3.4.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.3.2...5.3.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

tests/requirements.txt

@@ -7,7 +7,7 @@ isort==4.3.21
 mypy==0.761
 pycodestyle==2.5.0
 pyflakes==2.1.1
-pytest==5.3.2
+pytest==5.3.4
 pytest-cov==2.8.1
 pytest-mock==2.0.0
 pytest-sugar==0.9.2