src: update http-parser link

I noticed that the link to http-parser is pointing to the joyent
organization. There is a redirect to the nodejs organization but
perhaps this should be updated anyway.

PR-URL: https://github.com/nodejs/node/pull/11477
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

src/node_http_parser.cc

@@ -15,7 +15,7 @@
 #include <stdlib.h>  // free()
 #include <string.h>  // strdup()
 
-// This is a binding to http_parser (https://github.com/joyent/http-parser)
+// This is a binding to http_parser (https://github.com/nodejs/http-parser)
 // The goal is to decouple sockets from parsing for more javascript-level
 // agility. A Buffer is read from a socket and passed to parser.execute().
 // The parser then issues callbacks with slices of the data