add Symfony 5 requirement

Author: ivan1986

DependencyInjection/Configuration.php

@@ -18,8 +18,8 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('tmdb_symfony');
+        $treeBuilder = new TreeBuilder('tmdb_symfony');
+        $rootNode = $treeBuilder->getRootNode();
 
         $rootNode
             ->children()

composer.json

@@ -14,17 +14,17 @@
     ],
     "require": {
         "php": ">=5.5.0",
-        "symfony/config": ">=2.7,<5",
-        "symfony/dependency-injection": ">=2.7,<5",
-        "symfony/event-dispatcher": ">=2.7,<5",
-        "symfony/http-kernel": ">=2.7,<5",
+        "symfony/config": "^4.3.7 || ^5.0",
+        "symfony/dependency-injection": "^4.3.7 || ^5.0",
+        "symfony/event-dispatcher": "^4.3.7 || ^5.0",
+        "symfony/http-kernel": "^4.3.7 || ^5.0",
         "doctrine/doctrine-cache-bundle": "^1.0",
         "php-tmdb/api": "^2.1",
         "twig/twig": "^1.11|^2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8||^5.0,<5.4",
-        "symfony/framework-bundle": ">=2.7,<5"
+        "symfony/framework-bundle": "^4.3.7 || ^5.0"
     },
     "autoload": {
         "psr-4": { "Tmdb\\SymfonyBundle\\": "" }