docs: Use American spelling (#381)

Author: validcube

README.md

@@ -100,7 +100,7 @@ To build a ReVanced CLI, you can follow the [documentation](/docs).
 
 You can find the documentation of ReVanced CLI [here](/docs).
 
-## 📜 Licence
+## 📜 License
 
 ReVanced CLI is licensed under the GPLv3 license. Please see the [license file](LICENSE) for more information.
 [tl;dr](https://www.tldrlegal.com/license/gnu-general-public-license-v3-gpl-3) you may copy, distribute and modify ReVanced CLI as long as you track changes/dates in source files.