Avoid double ports in host header

Previously, it was possible that the host header looks
like domain.com:4444:4444 - obviously a bug.

lib/cors-anywhere.js

@@ -184,7 +184,7 @@ var getHandler = exports.getHandler = function(options) {
       });
 
       // Only add port if it was explicitly set
-      req.headers.host = host + (match[4] ? ':' + port : '');
+      req.headers.host = hostname + (match[4] ? ':' + port : '');
 
       proxyRequest(req, res, proxy, full_url, {
         host: hostname,