8bitdo v2 compatibility

[supavgx]

Can you make a updated firmware of the latest release but compatible with 8bitdo latest v2 dongle?

Since in #57 you released a version for older dongle which is now hard to get, that firmware works with the dongle as far as button layout goes and as far as I can tell, however it wont allow me to switch paks with button combos thank you Ryan.