Update README.md

Author: Ed Fricker

README.md

@@ -2,7 +2,7 @@ ___
 Receiving the access code
 ========
 
-If you want to use the mod you need to authorize your application via client_id and client secret (see: [Creatubbles API documentation](https://stateoftheart.creatubbles.com/api) for more details).
+If you want to use the mod you need to authorize your application via client_id and client secret (see: [Creatubbles API documentation](https://developers.creatubbles.com/api) for more details).
 
 For now you can receive the client_id and client_secret by sending an email request to [[email protected]](mailto:[email protected])