Use older node API for checking listener length

Author: brianc

lib/query.js

@@ -70,7 +70,7 @@ Query.prototype.requiresPreparation = function() {
 //metadata used when parsing row results
 Query.prototype.handleRowDescription = function(msg) {
   this._result.addFields(msg.fields);
-  this._accumulateRows = this.callback || !this.listenerCount('row');
+  this._accumulateRows = this.callback || !this.listeners('row').length;
 };
 
 Query.prototype.handleDataRow = function(msg) {