Bump django from 2.2.9 to 2.2.10

Bumps [django](https://github.com/django/django) from 2.2.9 to 2.2.10.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.2.9...2.2.10)

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

Author: dependabot[bot]

requirements_dev.txt

@@ -3,5 +3,5 @@ pytest==3.5.0
 pytest-flake8
 pytest-cov==2.5.1
 flask
-django==2.2.9; python_version>="3.0"
+django==2.2.10; python_version>="3.0"
 webob