Bump pytest from 5.0.1 to 5.1.0

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.0.1 to 5.1.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.0.1...5.1.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

requirements-dev.txt

@@ -11,7 +11,7 @@ ipdb==0.12.2
 motor==2.0.0
 pytest-cov==2.7.1
 pytest-sugar==0.9.2
-pytest==5.0.1
+pytest==5.1.0
 python-dateutil==2.8.0
 sqlalchemy==1.3.7
 trafaret==1.2.0