Disable promo in RCG

bot/src/commands/rcg.ts

@@ -5,7 +5,7 @@ import { Message } from "discord.js";
 const rcgRe = /<input id="rcg_image".+value="([^"]+)".*\/>/i;
 
 async function randomComic(msg: Message) {
-    let result = await request("http://explosm.net/rcg/view/");
+    let result = await request("http://explosm.net/rcg/view/?promo=false");
     
     let regexResult = rcgRe.exec(result);