Support symfony 3 too

Author: GrahamCampbell

composer.json

@@ -12,7 +12,7 @@
     ],
     "require": {
         "league/glide": "^1.0",
-        "symfony/http-foundation": "^2.3"
+        "symfony/http-foundation": "^2.3|^3.0"
     },
     "require-dev": {
         "mockery/mockery": "^0.9",