add user-agent (fixes #4)

utils.js

@@ -25,6 +25,7 @@ export async function DiscordRequest(endpoint, options) {
     headers: {
       Authorization: `Bot ${process.env.DISCORD_TOKEN}`,
       'Content-Type': 'application/json; charset=UTF-8',
+      'User-Agent': 'Mozilla/5.0 (compatible; Discordbot/2.0; +https://discordapp.com)',
     },
     ...options
   });