Bump pytest from 4.5.0 to 5.4.2

Bumps [pytest](https://github.com/pytest-dev/pytest) from 4.5.0 to 5.4.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@4.5.0...5.4.2)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -3,7 +3,7 @@ Flask==1.0.2
 Flask-RESTful==0.3.8
 Jinja2==2.10.1
 mock==4.0.2
-pytest==4.5.0
+pytest==5.4.2
 requests==2.23.0
 requests-mock==1.7.0
 pytest-cov==2.7.1