Bump flake8 from 3.7.8 to 3.7.9 in /{{cookiecutter.app_name}}

Bumps [flake8](https://gitlab.com/pycqa/flake8) from 3.7.8 to 3.7.9.
- [Release notes](https://gitlab.com/pycqa/flake8/tags)
- [Commits](https://gitlab.com/pycqa/flake8/compare/3.7.8...3.7.9)

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

{{cookiecutter.app_name}}/Pipfile

@@ -51,7 +51,7 @@ pdbpp = "==0.10.2"
 
 # Lint and code style
 black = "==19.3b0"
-flake8 = "==3.7.8"
+flake8 = "==3.7.9"
 flake8-blind-except = "==0.1.1"
 flake8-debugger = "==3.2.0"
 flake8-docstrings = "==1.5.0"