fix: remove extra typeof in .to cluster helper

Author: AVVS

lib/cluster.js

@@ -401,7 +401,7 @@ Cluster.prototype.executeClusterDownCommands = function () {
 
 Cluster.prototype.to = function (name) {
   var fnName = '_select' + name[0].toUpperCase() + name.slice(1);
-  var fn = typeof this[fnName];
+  var fn = this[fnName];
   if (typeof fn !== 'function') {
     // programmatic error, can't happen in prod, so throw
     throw new Error('to ' + name + ' is not a valid group of nodes');