Update CONTRIBUTING.md (#126)

Author: syleeeee

CONTRIBUTING.md

@@ -10,7 +10,7 @@ source projects you are aware of. It will be amazing if you could help us by doi
 
 ### Contributor license agreement
 
-If you are sending a pull request and it's a non-trivial change beyond fixing typos, please make sure to sign
-[the ICLA (individual contributor license agreement)](https://feedback.line.me/enquete/public/919-h9Yqmr1u). Please
-contact us if you need the CCLA (corporate contributor license agreement).
+When you are sending a pull request and it's a non-trivial change beyond fixing typos, please make sure to sign
+[the ICLA (individual contributor license agreement)](https://cla-assistant.io/line/line-bot-sdk-python). Please
+[contact us](mailto:[email protected]) if you need the CCLA (corporate contributor license agreement).