Merge pull request #1061 from saschalalala/patch-1

Add a mising import

Author: camilonova

docs/installation.rst

@@ -43,7 +43,8 @@ URLconf
 Add the Debug Toolbar's URLs to your project's URLconf as follows::
 
     from django.conf import settings
-    from django.conf.urls import include, url
+    from django.conf.urls import include, url  # For django versions before 2.0
+    from django.urls import include, path  # For django versions from 2.0 and up
 
     if settings.DEBUG:
         import debug_toolbar