ATTiny 841?

[gritd]

So I just wanted to start on the attiny841 which is sort of a attiny84+ Would be great if this is supported in this library. I now have installed an extra thingy from:
https://github.com/SpenceKonde/arduino-tiny-841
but the avrdude does not find the 841... and with installing both the build options get a bit unlogical.