Fixup NJSON use

I've seen some more stars recently and has tested cl-telegram-bot-auto-api just to make sure it was working. It wasn't, due to NJSON updates.

I fixed it and it seems to work with the latest (1.2.1) NJSON. Should work now.

I'd like to make it use jzon backend for NJSON, but that's for later. For now, good luck using this library and report if something is wrong ❤️