Corrected IRC channel in README.md
Corrected IRC channel in README.md

All discussions have moved from the old IRC channel
myriadcoin/myriadcoin,myriadcoin/myriadcoin,myriadteam/myriadcoin,myriadcoin/myriadcoin,myriadcoin/myriadcoin,myriadteam/myriadcoin,myriadteam/myriadcoin,myriadteam/myriadcoin,myriadcoin/myriadcoin,myriadteam/myriadcoin,myriadteam/myriadcoin,myriadcoin/myriadcoin