Bump pytest from 3.4.2 to 4.6.2

Bumps [pytest](https://github.com/pytest-dev/pytest) from 3.4.2 to 4.6.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@3.4.2...4.6.2)

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

requirements.txt

@@ -7,7 +7,7 @@ funcsigs==1.0.2
 idna==2.8
 pluggy==0.12.0
 py==1.8.0
-pytest==3.4.2
+pytest==4.6.2
 PyYAML==5.1.1
 requests==2.22.0
 selenium==3.141.0