Upgrade vendors

Author: mcg-web

composer.json

@@ -4,6 +4,7 @@
     "type": "project",
     "config" : {
         "bin-dir": "bin",
+        "platform": {"php": "5.6"},
         "sort-packages": true
     },
     "autoload": {
@@ -22,20 +23,20 @@
     },
     "require": {
         "php": ">=5.5.9",
-        "symfony/symfony": "3.2.*",
+        "symfony/symfony": "3.4.*",
         "doctrine/orm": "^2.5",
         "doctrine/doctrine-bundle": "^1.6",
         "doctrine/doctrine-cache-bundle": "^1.2",
         "symfony/monolog-bundle": "^2.8",
         "sensio/distribution-bundle": "^5.0",
         "sensio/framework-extra-bundle": "^3.0.2",
         "incenteev/composer-parameter-handler": "^2.0",
-        "overblog/graphql-bundle": "dev-master",
+        "overblog/graphql-bundle": "^0.9.0",
         "twig/twig": "^1.30"
     },
     "require-dev": {
         "sensio/generator-bundle": "^3.0",
-        "symfony/phpunit-bridge": "^3.2",
+        "symfony/phpunit-bridge": "^3.4",
         "doctrine/doctrine-fixtures-bundle": "^2.3",
         "phpunit/phpunit": "^4.1|^5.1",
         "liip/functional-test-bundle": "^1.5"