Keyboard.h not working

[Glinek]

I have not tested this thoroughly but I encountered an issue with keyboard.h lib not working on version 5.4 (haven't had the time to test if this issue occurs on other versions). Version 5.0.0 of this lib works fine and I am able to use keyboard.write() but when upgrading to version 5.4 keyboard.write() no longer works.

[earlephilhower]

#3207 identified an issue when 2 HID devices were running, which was fixed w/a 1 character change in #3208. There'll be anew core release today with that and a couple LWIP fixes, or you can use git master instead.