Require stable version of coding standard, refer to testing suite in readme

Author: Ashoka de Wit

README.md

@@ -24,15 +24,17 @@ root of the project.
 </ruleset>
 ```
 
-# Integration with PHPStorm
+# Integration with PHPStorm and automatic testing
 
-When the phpcs.xml file exists it will be automatically configured by
-`media/coding-standard-phpstorm`. This is triggered by the composer command.
+The recommended way to enable the coding standard in PHPStorm and automatic
+testing is by requiring the MediaCT testing suite in a project.
 
 ```shell
-$ composer install
+$ composer require --dev mediact/testing-suite
 ```
 
+For more information go to [MediaCT Testing Suite](https://github.com/mediact/testing-suite).
+
 # Contribution guidelines
 
 Contributions are welcome. Please create pull requests which add or remove

composer.json

@@ -21,10 +21,8 @@
     }
   ],
   "require": {
-    "php": "^5.4.0 || ^7.0",
-    "mediact/coding-standard": "^1.0",
-    "squizlabs/php_codesniffer": "^2.0",
-    "magento/marketplace-eqp": "^1.0"
+    "magento/marketplace-eqp": "^1.0",
+    "mediact/coding-standard": "@stable"
   },
   "autoload": {
     "psr-0": {