Make it installable with vendor folder usage

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "silverstripe/versionfeed",
     "description": "Adds RSS feeds of content changes to SilverStripe",
-	"type": "silverstripe-module",
+    "type": "silverstripe-vendormodule",
     "keywords": ["silverstripe", "rss", "feed", "cwp"],
     "license": "BSD-3-Clause",
     "authors": [
@@ -12,14 +12,25 @@
     ],
     "require":
     {
-		"silverstripe/framework": "^3.1",
-		"silverstripe/cms": "^3.1"
+        "silverstripe/recipe-cms": "^1"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^5.7",
+        "squizlabs/php_codesniffer": "^3.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "SilverStripe\\VersionFeed\\": "src/",
+            "SilverStripe\\VersionFeed\\Tests\\": "tests/"
+        }
     },
     "extra": 
     {
         "branch-alias": 
         {
-			"dev-master": "1.3.x-dev"
-		}
+            "dev-master": "2.x-dev"
         }
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
 }