Update composer.json

Updated to be compatible with Symfony 3

Author: DavertMik

composer.json

@@ -15,7 +15,7 @@
     "require": {
         "php": ">=5.4.0",
         "goaop/framework": "0.6.*",
-        "symfony/finder": "~2.4"
+        "symfony/finder": "~2.4|~3.0"
     },
     "require-dev": {
         "codeception/base": "~2.1",