docs: update intersphinx_mapping for Django

Author: blueyed

Diff for: docs/conf.py

@@ -64,6 +64,6 @@
 
 intersphinx_mapping = {
     'python': ('https://docs.python.org/3', None),
-    'django': ('http://docs.djangoproject.com/en/dev/',
-               'http://docs.djangoproject.com/en/dev/_objects/'),
+    'django': ('https://docs.djangoproject.com/en/dev/',
+               'https://docs.djangoproject.com/en/dev/_objects/'),
 }