support _ names in nip05.

nip05.js

@@ -15,6 +15,12 @@ export async function searchDomain(domain, query = '') {
 export async function queryName(fullname) {
   try {
     let [name, domain] = fullname.split('@')
+
+    if (!domain) {
+      domain = name
+      name = '_'
+    }
+
     let res = await (
       await fetch(`https://${domain}/.well-known/nostr.json?name=${name}`)
     ).json()