fix(bug-fix): For deprecated function models()

Author: ehdsouza

watson_developer_cloud/speech_to_text_v1.py

@@ -113,7 +113,7 @@ def list_models(self):
 
     @deprecated('Use list_models instead.')
     def models(self):
-        return self.list_models
+        return self.list_models()
 
     #########################
     # Sessionless