Correction function name

修正函数名（大写比较合适

node_modules/superagent/lib/node/index.js

@@ -594,7 +594,7 @@ Request.prototype.ca = function(cert){
  * @param  {[type]} ignore [description]
  * @return {[type]}        [description]
  */
-Request.prototype.ignoreHttps = function(ignore) {
+Request.prototype.ignoreHTTPS = function(ignore) {
   this._ignoreHttps = !ignore;
   return this;
 };