!tweetnewset - generate an image to announce a new set on twitter

[meleu]

Example: https://twitter.com/RetroCheevos/status/1443904635996151812/photo/1

Suggested alias: !tns

It can use Canvas, just like I did for the !hotcheevs command: https://github.com/RetroAchievements/RABot/blob/master/commands/rautil/hotcheevs.js

Here's the background used: