update api plateform

Author: nicolas-grevin

composer.json

@@ -26,7 +26,7 @@
     "require": {
         "php": "^7.1.3",
         "ext-iconv": "*",
-        "api-platform/api-pack": "^1.0",
+        "api-platform/api-pack": "^2.0",
         "doctrine/doctrine-bundle": "^1.8",
         "doctrine/doctrine-fixtures-bundle": "^3.0",
         "doctrine/orm": "^2.6",