restore gitter plain url token

.travis.yml

@@ -26,7 +26,7 @@ script:
 notifications:
   webhooks:
     urls:
-      - $GITTER_IM_URL
+      - https://webhooks.gitter.im/e/41a19fbf1d54a04e5217
       - https://registry.hub.docker.com/u/zixia/wechaty/trigger/01585c2b-175b-4d27-b09d-e380a052c17c/
     on_success: change  # options: [always|never|change] default: always
     on_failure: always  # options: [always|never|change] default: always

README.md

@@ -69,7 +69,7 @@ $ export TOKEN="your token here"
 $ docker run -e WECHATY_TOKEN="$TOKEN" zixia/wechaty
 ```
 
-`TOKEN` is required here, because you need this key in the next step, to manage wechaty on the chatbot cloud manager: https://www.wechaty.io
+`WECHATY_TOKEN` is required here, because you need this key to manage wechaty on the chatbot cloud manager: https://www.wechaty.io
 
 ## Deploy with Heroku