- use avr-gcc 5.4.0 shipped with Arduino 1.8.7 as it's the only one
that supports PB chips
- added new targets (mostly ATtiny chips)
- generate comparison with emoji by default
- update allow_failures
This is very basic support, it compiles Optiboot using
avr-tools only from one Arduino version, currently 1.6.9.
Attiny84 is in 'allow_failures' as it currently doesn't
compile on any version of tools.