update better-scroll

package.json

@@ -11,7 +11,7 @@
     "build": "node build/build.js"
   },
   "dependencies": {
-    "better-scroll": "^1.4.2",
+    "better-scroll": "^1.6.1",
     "vue": "^2.5.2",
     "vue-resource": "^1.3.4",
     "vue-router": "^3.0.1"