Credit should be given where credit is due

don't get me wrong, i don't plan on maintaining the ch.py any longer than i
but i am sure i done more than enough to be consider as a major contributor
and asking for a line in the readme isn't a lot to ask for.

ps: i have already email nullspeaker about this
and below is part of what he reply to me

"I readded you to contributors so you may slip in a note
about yourself in the README.md and leave or return to contributing once
more.."