Symfony 5 support

Author: yann-eugone

composer.json

@@ -12,7 +12,7 @@
     ],
     "require": {
         "php": ">=5.5.9",
-        "symfony/dependency-injection": "~2.7|~3.0|~4.0"
+        "symfony/dependency-injection": "~2.7|~3.0|~4.0|~5.0"
     },
     "autoload": {
         "psr-4": { "Yokai\\DependencyInjection\\": "src" }