Update CONTRIBUTING.md

Author: JaZo

CONTRIBUTING.md

@@ -2,11 +2,13 @@
 
 Contributions are **welcome** and will be fully **credited**.
 
-We accept contributions via Pull Requests on [Github](https://github.com/swisnl/laravel-javascript-data-response).
+We accept contributions via Pull Requests on [Github](https://github.com/swisnl/json-api-client).
 
 
 ## Pull Requests
 
+- **Follow the specification** - This package intents to follow the [specification](https://jsonapi.org/format/). Make sure your patch does not violate the specification.
+
 - **[PSR-2 Coding Standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)** - Check the code style with ``$ composer check-style`` and fix it with ``$ composer fix-style``.
 
 - **Add tests!** - Your patch won't be accepted if it doesn't have tests.