Bump pytest from 5.3.0 to 5.3.1 in /{{cookiecutter.app_name}}

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.3.0 to 5.3.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/5.3.0...5.3.1)

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

{{cookiecutter.app_name}}/Pipfile

@@ -44,7 +44,7 @@ environs = "==6.1.0"
 
 [dev-packages]
 # Testing
-pytest = "==5.3.0"
+pytest = "==5.3.1"
 WebTest = "==2.0.33"
 factory-boy = "==2.12.*"
 pdbpp = "==0.10.2"