bump to v3.4.0

Author: Csaba Varro

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "prerender-node",
-  "version": "3.3.0",
+  "version": "3.4.0",
   "description": "express middleware for serving prerendered javascript-rendered pages for SEO",
   "author": "Todd Hooper",
   "license": "MIT",
@@ -23,6 +23,5 @@
   },
   "scripts": {
     "test": "echo 'Make sure to unset PRERENDER_SERVICE_URL when running locally' && ./node_modules/.bin/mocha"
-  },
-  "dependencies": {}
+  }
 }