IG-11702: Update to Symfony 3.4

 - updated composer to be compatible with Symfony 3.4

Change-Id: Icbcab141d09095d9c34df33f7b26adab299406f9

composer.json

@@ -12,18 +12,18 @@
     },
     "require": {
         "php"                         : ">=5.5.0",
-        "symfony/yaml"                : ">=2.4.8 <3.0",
-        "symfony/dependency-injection": ">=2.4.8 <3.0",
-        "symfony/config"              : ">=2.4.8 <3.0",
+        "symfony/yaml"                : ">=2.4.8",
+        "symfony/dependency-injection": ">=2.4.8",
+        "symfony/config"              : ">=2.4.8",
         "amnl/gc-datatable"           : ">=0.2.0"
     },
     "require-dev": {
-        "symfony/console": ">=2.4.8 <3.0",
-        "symfony/framework-bundle": ">=2.4.8 <3.0",
+        "symfony/console": ">=2.4.8",
+        "symfony/framework-bundle": ">=2.4.8",
         "phpunit/phpunit": ">=4.6.9",
-        "symfony/finder": ">=2.4.8 <3.0",
-        "symfony/process": ">=2.4.8 <3.0",
-        "symfony/browser-kit": ">=2.4.8 <3.0",
+        "symfony/finder": ">=2.4.8",
+        "symfony/process": ">=2.4.8",
+        "symfony/browser-kit": ">=2.4.8",
         "ruflin/elastica": "2.3.1",
         "doctrine/orm": ">=2.4"
     },