change sendMessage wrapper, migrate from websocket connection to webhook for EventSub (reverse proxy)

bot/commands/ping.ts

@@ -5,6 +5,6 @@ export default new Command('ping',
   ['ping'],
   [],
   async msg => {
-    await sendMessage('pong!', { replyParentMessageId: msg.messageId });
+    await sendMessage('pong!', msg.messageId);
   }
 );