Allow collections 2

Author: greg0ire

composer.json

@@ -24,7 +24,7 @@
         "composer-runtime-api": "^2",
         "ext-ctype": "*",
         "doctrine/cache": "^1.12.1 || ^2.1.1",
-        "doctrine/collections": "^1.5",
+        "doctrine/collections": "^1.5 || ^2.0",
         "doctrine/common": "^3.0.3",
         "doctrine/dbal": "^2.13.1 || ^3.2",
         "doctrine/deprecations": "^0.5.3 || ^1",