Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -4,7 +4,9 @@
 First of all, thank you so much for taking your time to contribute! We always welcome your ideas and feedback. Please feel free to make any pull requests.
 
 ### 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/1056-958iVfco). 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/stellite). Please
+[contact us](mailto:dl_oss_dev@linecorp.com) if you need the CCLA (corporate contributor license agreement).
 
 ### Coding style guide
 Stellite follows the [Chromium coding guide](https://www.chromium.org/developers/coding-style). Please make sure to follow this style guide when you make a pull request.