Chore: update CONTRIBUTING.md

CONTRIBUTING.md

@@ -10,5 +10,5 @@ Please use `Android Studio` or `Intellij IDEA` to open the project and use the p
 
 #### License
 
-Contributing to Clash for Android that assumes you allow code to be merged into closed-source branches. Other terms follow the [GPLv3](https://www.gnu.org/licenses/gpl-3.0.html)
+Contributing to Clash for Android that assumes you allow code to be merged into closed-source branch of Clash for Android. Other terms follow the [GPLv3](https://www.gnu.org/licenses/gpl-3.0.html)