Bump django from 2.1.11 to 2.2.10

Bumps [django](https://github.com/django/django) from 2.1.11 to 2.2.10.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.1.11...2.2.10)

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 colorama==0.4.1
 concept-formation==0.3.4
 dill==0.2.8.2
-Django==2.1.11
+Django==2.2.10
 django-codemirror2==0.2
 django-cors-headers==2.4.0
 django-flashpolicies==1.10