Test against PHP 8, allow ECS 9, upgrade config to PHP file

.travis.yml

@@ -1,13 +1,14 @@
 language: php
 
 php:
-    - 7.2
     - 7.3
     - 7.4
+    - 8.0
 
 env:
     - ECS_VERSION="^7.0"
     - ECS_VERSION="^8.0"
+    - ECS_VERSION="^9.0"
 
 cache:
     directories:
@@ -22,4 +23,4 @@ install:
 script:
     - composer validate --strict
 
-    - vendor/bin/ecs check tests
+    - vendor/bin/ecs check --config ecs.php tests ecs.php

README.md

@@ -13,9 +13,25 @@ Installation & usage
     $ composer require --dev sylius-labs/coding-standard
     ```
 
-2. Include a configuration file in your `easy-coding-standard.yml`:
+2. Import the configuration file in your `ecs.php`:
 
-    ```yml
-    imports:
-        - { resource: 'vendor/sylius-labs/coding-standard/easy-coding-standard.yml' }
+    ```php
+    $containerConfigurator->import('vendor/sylius-labs/coding-standard/easy-coding-standard.php');
     ```
+
+Example config (ecs.php)
+------------------------
+
+    ```php
+    use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+
+    return static function (ContainerConfigurator $containerConfigurator): void {
+        $containerConfigurator->import('vendor/sylius-labs/coding-standard/easy-coding-standard.php');
+    };
+    ```
+
+Upgrade from YML to PHP config file
+-----------------------------------
+
+Use this [package](https://github.com/symplify/config-transformer) and follow their guidelines
+to automatically migrate your YML config to a PHP config file.

composer.json

@@ -10,9 +10,9 @@
         }
     ],
     "require": {
-        "php": "^7.1 || ^8.0",
+        "php": "^7.3 || ^8.0",
         "slevomat/coding-standard": "^6.3",
-        "symplify/easy-coding-standard": "^7.3 || ^8.1"
+        "symplify/easy-coding-standard": "^7.3 || ^8.1 || ^9.0"
     },
     "autoload-dev": {
         "psr-4": {