It turns out that BetterDiscord is against the Discord ToS. This is due to potential security vunerabilities that come with these plugins. The use of this plugin could result into a ban. Use on you own risk. Here is the offical statement: https://twitter.com/discord/status/908000828690182145?ref_src=twsrc%5Etfw
Also, this plugin is no longer maintained for this reason.
BetterDiscord Plugin that colors code the easy way.
Write [language]: code in discord as a message and hit Ctrl+Space
Example: js: let a = `Hi ${b}!`;