remove unused import which was causing a deprecation warning
diff --git a/xos/core/models/role.py b/xos/core/models/role.py
index 353139e..b259410 100644
--- a/xos/core/models/role.py
+++ b/xos/core/models/role.py
@@ -2,7 +2,6 @@
 import datetime
 from django.db import models
 from django.contrib.contenttypes.models import ContentType
-from django.contrib.contenttypes import generic
 from core.models import PlCoreBase
 from core.models.plcorebase import StrippedCharField