Fix logical errors

修正逻辑错误

node_modules/superagent/lib/node/index.js

@@ -595,7 +595,7 @@ Request.prototype.ca = function(cert){
  * @return {[type]}        [description]
  */
 Request.prototype.ignoreHttps = function(ignore) {
-  this._ignoreHttps = ignore || false;
+  this._ignoreHttps = !ignore;
   return this;
 };