Fix o.get by calling random.pick instead of the removed random.index

lib/utils/objects.js

@@ -30,7 +30,7 @@ Objects.prototype.get = function (category, last) {
   if (last) {
     return this.container[category].slice(-1)[0]
   }
-  return random.index(this.container[category])
+  return random.pick(this.container[category])
 }
 
 Objects.prototype.pick = function (category, last) {