Merge pull request #9 from jbfewo/master

Add Symfony4 support

Author: ScullWM

composer.json

@@ -13,7 +13,7 @@
     ],
     "require": {
         "php": ">=5.3.9",
-        "symfony/framework-bundle": "~2.8|~3.0"
+        "symfony/framework-bundle": "~2.8|~3.0|~4.0"
     },
     "require-dev": {
         "atoum/atoum": "dev-master"
@@ -25,4 +25,4 @@
         "psr-4": { "Swm\\Bundle\\MailHookBundle\\": "" },
         "exclude-from-classmap": ["/tests/"]
     }
-}
+}