MarketBot version 1.1.0 is out and brings many new features! Among them are price tracking, improved error messages, reworked command output, more stability and loooooooots of bugfixes!
Under the hood I’m now using the latest Typescript features and development with them is a breeze, expect more features to arrive soon! 
Suggestions for features are always welcome!
Try Marketbot in my development channel or add the bot to your own server!