code clean

.travis.yml

@@ -30,7 +30,7 @@ script:
   - echo $TRAVIS_OS_NAME
   - node --version
   - npm --version
-  - n=0; npm test; while ((n < 3 && $? > 0)); do ((n++)); npm test; done
+  - ./script/safe-test.sh
 
 after_success:
   - if [ "$TRAVIS_OS_NAME" == 'osx' ]; then npm run coverage; fi

README.md

@@ -214,9 +214,9 @@ Make sure to add tests for your features and bugfixes and update the documentati
 
 You can directly submit pull requests for documentation changes.
 
-## Join Us
+## Join US
 
-Wechaty is used in many ChatBot projects by hundreds of developers. If you want to talk with other developers, just scan the following QR Code in WeChat with secret code _wechaty_, join our **Wechaty Developers' Home** now.
+Wechaty is used in many ChatBot projects by hundreds of developers. If you want to talk with other developers, just scan the following QR Code in WeChat with secret code _wechaty_, join our **Wechaty Developers' Home**.
 
 ![Wechaty Developers' Home](https://chatie.io/wechaty/images/bot-qr-code.png)