FIX: for is_instance exception in new_base implementation

Change-Id: I191d1113b1fc43335767673efc9ec634406561af
diff --git a/xos/synchronizers/new_base/djangoaccessor.py b/xos/synchronizers/new_base/djangoaccessor.py
index 66ded70..759ba2b 100644
--- a/xos/synchronizers/new_base/djangoaccessor.py
+++ b/xos/synchronizers/new_base/djangoaccessor.py
@@ -73,7 +73,7 @@
     def is_type(self, obj, name):
         return type(obj) == self.get_model_class(name)
 
-    def is_type(self, obj, name):
+    def is_instance(self, obj, name):
         return isinstance(obj, self.get_model_class(name))