pin django taggit version

Author: brunosmartin

requirements/base.txt

@@ -23,9 +23,9 @@ pandas==0.20.3
 requests~=2.18  # for communication with the rocketchat API
 
 # django-cards dependencies
-django-taggit~=0.22
-django-taggit-serializer~=0.1
-drf-writable-nested~=0.3
+django-taggit==0.22
+django-taggit-serializer==0.1
+drf-writable-nested==0.3
 
 # django-filter==0.7
 django-filter==0.10.0