Updated composer.json constraints

Author: lyrixx

composer.json

@@ -23,8 +23,8 @@
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.10",
-        "symfony/phpunit-bridge": "^3.4@beta",
-        "symfony/process": "^3.3"
+        "symfony/phpunit-bridge": "^3.4",
+        "symfony/process": "^3.4"
     },
     "autoload": {
         "psr-4": {