update LICENSE

README.md

@@ -76,15 +76,10 @@ It is recommended to use [rust.sh](./rust.sh) to auto-compile the Rust code
 
 ## License
 
-This project is licensed under either of
-
- * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
-   http://www.apache.org/licenses/LICENSE-2.0)
- * MIT license ([LICENSE-MIT](LICENSE-MIT) or
-   http://opensource.org/licenses/MIT)
-
-at your option.
+This project is licensed under
 
+ * GNU GENERAL PUBLIC LICENSE, Version 3.0, ([LICENSE](LICENSE)
+ * Any question, please contact: contact@cympletech.com
 
 ## Donation