Update django-taggit from 1.5.1 to 2.0.0

Author: pyup-bot

requirements/pip.txt

@@ -87,7 +87,7 @@ textblob==0.17.1
 django-annoying==0.10.6
 django-messages-extends==0.6.2
 djangorestframework-jsonp==1.0.2
-django-taggit==1.5.1
+django-taggit==2.0.0
 dj-pagination==2.5.0
 
 # Version comparison stuff