Bump pep8-naming from 0.8.2 to 0.9.0 in /{{cookiecutter.app_name}}

Bumps [pep8-naming](https://github.com/PyCQA/pep8-naming) from 0.8.2 to 0.9.0.
- [Release notes](https://github.com/PyCQA/pep8-naming/releases)
- [Changelog](https://github.com/PyCQA/pep8-naming/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/PyCQA/pep8-naming/compare/0.8.2...0.9.0)

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

{{cookiecutter.app_name}}/Pipfile

@@ -57,4 +57,4 @@ flake8-debugger = "==3.2.1"
 flake8-docstrings = "==1.5.0"
 flake8-isort = "==2.7.0"
 isort = "==4.3.21"
-pep8-naming = "==0.8.2"
+pep8-naming = "==0.9.0"