fix typo in dialogflow_client.py

Author: knorth55

dialogflow_task_executive/node_scripts/dialogflow_client.py

@@ -271,7 +271,7 @@ def speak_result(self, result):
             volume=self.volume)
 
         # for japanese or utf-8 languages
-        if self.language == 'ja-JP' and sys.version <= 2:
+        if self.language == 'ja-JP' and sys.version_info.major <= 2:
             msg.arg = result.fulfillment_text.encode('utf-8')
         else:
             msg.arg = result.fulfillment_text