Merge pull request #35 from SheCodesAus/bug-fix/change-permission

replace owner with created_by

exception_al/workshops/permissions.py

@@ -4,4 +4,4 @@ class   IsOwnerOrReadOnly(permissions.BasePermission):
     def has_object_permission(self, request, view, obj):
         if request.method in permissions.SAFE_METHODS:
             return True
-        return obj.owner == request.user
+        return obj.created_by == request.user