extending ContainerAware is deprecated since symfony version 2.8 (#6)

* extending ContainerAware is deprecated since symfony version 2.8, and removed in 3.0
* updated symfony component requirements

* updated symfony version, package version

* removed symfony version string vom composer.json

README.md

@@ -10,7 +10,7 @@ The GoogleTagManagerBundle provides you an easy-to-use method to integrate the G
 ## Requirements
 
 - [x] PHP 5.3 and higher
-- [x] Symfony 2.0 and higher
+- [x] Symfony 2.8 and higher
 
 ## Install
 
@@ -20,7 +20,7 @@ Open a command console, enter your project directory and execute the
 following command to download the latest stable version of this bundle:
 
 ```bash
-$ composer require xynnn/google-tag-manager-bundle "~1.0"
+$ composer require xynnn/google-tag-manager-bundle "~2.0"
 ```
 
 This command requires you to have Composer installed globally, as explained

Service/GoogleTagManagerFactory.php

@@ -10,16 +10,18 @@
 
 namespace Xynnn\GoogleTagManagerBundle\Service;
 
-use Symfony\Component\DependencyInjection\ContainerAware;
+use Symfony\Component\DependencyInjection\ContainerAwareTrait;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Class GoogleTagManagerFactory
  *
  * @package Xynnn\GoogleTagManagerBundle\Service
  */
-class GoogleTagManagerFactory extends ContainerAware
+class GoogleTagManagerFactory
 {
+    use ContainerAwareTrait;
+
     /**
      * @return ContainerInterface
      */

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "xynnn/google-tag-manager-bundle",
     "type": "symfony-bundle",
-    "description": "Google Tag Manager Bundle for Symfony 2",
+    "description": "Google Tag Manager Bundle for Symfony",
     "keywords": ["Google Tag Manager", "Tag Manager"],
     "homepage": "https://github.com/xyNNN/GoogleTagManagerBundle",
     "license": "GNU LGPL v3.0",
@@ -14,9 +14,9 @@
     "minimum-stability": "dev",
     "require": {
         "php": ">=5.3.2",
-        "symfony/dependency-injection": "~2.3",
-        "symfony/http-kernel": "~2.3",
-        "symfony/config": "~2.3"
+        "symfony/dependency-injection": "~2.8|~3.0",
+        "symfony/http-kernel": "~2.8|~3.0",
+        "symfony/config": "~2.8|~3.0"
     },
     "require-dev": {
         "phpunit/phpunit":  "~4.3"