fix buffer import and use rollup for transpiling the package.

event.js

@@ -1,4 +1,4 @@
-import {Buffer} from 'buffer'
+import Buffer from 'buffer'
 import * as secp256k1 from '@noble/secp256k1'
 
 import {sha256} from './utils'

nip04.js

@@ -1,4 +1,4 @@
-import {Buffer} from 'buffer'
+import Buffer from 'buffer'
 import * as secp256k1 from '@noble/secp256k1'
 
 export function encrypt(privkey, pubkey, text) {

nip05.js

@@ -1,4 +1,4 @@
-import {Buffer} from 'buffer'
+import Buffer from 'buffer'
 import dnsPacket from 'dns-packet'
 
 const dohProviders = [

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nostr-tools",
-  "version": "0.6.4",
+  "version": "0.6.3",
   "description": "Tools for making a Nostr client.",
   "main": "dist/nostr-tools.esm.min.js",
   "module": "dist/nostr-tools.esm.min.js",