fix readme example.

fixes https://github.com/nbd-wtf/nostr-tools/issues/136

README.md

@@ -10,7 +10,6 @@ Only depends on _@scure_ and _@noble_ packages.
  npm install nostr-tools # or yarn add nostr-tools
 ```
 
-
 ## Usage
 
 ### Generating a private key and a public key
@@ -138,11 +137,16 @@ const pool = new SimplePool()
 
 let relays = ['wss://relay.example.com', 'wss://relay.example2.com']
 
-let relay = await pool.ensureRelay('wss://relay.example3.com')
-
-let sub = pool.sub([...relays, relay], [{
-  authors: ['32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245']
-}])
+let sub = pool.sub(
+  [...relays, 'wss://relay.example3.com'],
+  [
+    {
+      authors: [
+        '32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245'
+      ]
+    }
+  ]
+)
 
 sub.on('event', event => {
   // this will only be called once the first time the event is received