VersionRestServlet doesn't take a param

synapse/app/client_reader.py

@@ -114,7 +114,7 @@ class ClientReaderServer(HomeServer):
                     KeyChangesServlet(self).register(resource)
                     VoipRestServlet(self).register(resource)
                     PushRuleRestServlet(self).register(resource)
-                    VersionsRestServlet(self).register(resource)
+                    VersionsRestServlet().register(resource)
 
                     resources.update({
                         "/_matrix/client": resource,