Add TODO note on getting the libuv loop
Add TODO note on getting the libuv loop

The loop should be fetched from the current Enrionment instance. It's
exposed as env->event_loop().

joelpurra/getdns-node,getdnsapi/getdns-node,getdnsapi/getdns-node,getdnsapi/getdns-node,joelpurra/getdns-node,joelpurra/getdns-node