Merge pull request liangliangyy#340 from liangliangyy/dependabot/pip/django-2.2.8

Bump django from 2.2.6 to 2.2.8

Author: liangliangyy

requirements.txt

@@ -8,7 +8,7 @@ cffi==1.13.1
 chardet==3.0.4
 coverage==4.5.4
 cryptography==2.8
-Django==2.2.6
+Django==2.2.8
 django-appconf==1.0.3
 django-autoslug==1.9.6
 django-compressor==2.3