Fix ATtiny25 compilation issue (port definitions) (#728)
Fix ATtiny25 compilation issue (port definitions) (#728)

* Fix ATtiny25 compilation issue

The ATtiny25 does not have PORTA. It would give compilation errors.

Also, because the ATtiny25 has a very small storage capacity, a compilation message will be presented warning the user.

* Update fastpin_avr.h

* Fix char type

FastLED/FastLED,FastLED/FastLED,PaulStoffregen/FastLED,PaulStoffregen/FastLED,FastLED/FastLED,PaulStoffregen/FastLED,FastLED/FastLED