Update sync.py (#1308)

* Update sync.py

add 'monitoring' and 'sampling_interval' params to subscribe_data_change in sync.py.

* Update sync.py

asyncua/sync.py

@@ -615,7 +615,11 @@ class Subscription:
         self.aio_obj = sub
 
     @syncmethod
-    def subscribe_data_change(self, nodes, attr=ua.AttributeIds.Value, queuesize=0):
+    def subscribe_data_change(self, nodes,
+                              attr=ua.AttributeIds.Value,
+                              queuesize=0,
+                              monitoring=ua.MonitoringMode.Reporting,
+                              sampling_interval=0.0):
         pass
 
     @syncmethod