Merge pull request #88 from syleeeee/update-contributing

Update CONTRIBUTING.md

Author: kimoto

CONTRIBUTING.md

@@ -10,6 +10,6 @@ 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-ruby). Please
+[contact us](mailto:dl_oss_dev@linecorp.com) if you need the CCLA (corporate contributor license agreement).