Add missing delete method

Author: adescamps

dataikuapi/dss/flow.py

@@ -391,6 +391,12 @@ def get_graph(self):
         data = self.client._perform_json("GET", "/projects/%s/flow/zones/%s/graph" % (self.flow.project.project_key, self.id))
         return DSSProjectFlowGraph(self.flow, data)
 
+    def delete(self):
+        """
+        Delete the zone, all items will be moved to the default zone
+        """
+        return self.client._perform_empty("DELETE", "/projects/%s/flow/zones/%s" % (self.flow.project.project_key, self.id))
+
 
 class DSSFlowZoneSettings(object):
     """The settings of a flow zone. Do not create this directly, use :meth:`DSSFlowZone.get_settings`"""