updated description to reflect requirement of Vue 2.0

Author: LinusBorg

package.json

@@ -6,7 +6,7 @@
     "vue-touch.js",
     "vue-touch.min.js"
   ],
-  "description": "Hammer.js based touch events plugin for Vue.js",
+  "description": "Hammer.js based touch events plugin for Vue.js 2.0",
   "license": "MIT",
   "repository": {
     "type": "git",