Allow FosJSRoutingBundle dev for Sf 3 support

Author: wouterj

composer.json

@@ -8,6 +8,7 @@
             "homepage": "https://github.com/symfony-cmf/Routing/contributors"
         }
     ],
+    "prefer-stable": true,
     "require": {
         "php": "^5.3.9|^7.0",
         "symfony/symfony": "^2.3|3.*",
@@ -20,7 +21,7 @@
         "doctrine/data-fixtures": "^1.0.0-alpha3",
         "jackalope/jackalope": "^1.1.5",
         "jackalope/jackalope-doctrine-dbal": "^1.1.5",
-        "friendsofsymfony/jsrouting-bundle": "^1.1"
+        "friendsofsymfony/jsrouting-bundle": "^1.1@dev"
     },
     "autoload": {
         "psr-4": {