Bump pytest from 3.6.3 to 3.6.4 in /{{cookiecutter.app_name}}

Bumps [pytest](https://github.com/pytest-dev/pytest) from 3.6.3 to 3.6.4.
- [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/3.6.3...3.6.4

)

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