added policy for Site model
diff --git a/planetstack/model_policies/__init__.py b/planetstack/model_policies/__init__.py
index 8671d6a..ac395a1 100644
--- a/planetstack/model_policies/__init__.py
+++ b/planetstack/model_policies/__init__.py
@@ -1,3 +1,4 @@
 from .model_policy_Slice import *
 from .model_policy_User import *
 from .model_policy_Network import *
+from .model_policy_Site import *