Add support for ATmega1281

PCINT0..7 are on PB0..7
-> PCINT8 on PE0 not supported  <-
PCINT9..15 are on PJ0..6
PCINT16..32 are on PK0..7

Author: SlashDevin

library.properties

@@ -1,5 +1,5 @@
 name=NeoSWSerial
-version=3.0.2
+version=3.0.3
 author=SlashDevin
 maintainer=SlashDevin
 sentence=An efficient replacement for SoftwareSerial at baud rates 9600, 19200 and 38400.

src/NeoSWSerial.cpp

@@ -476,6 +476,13 @@ void NeoSWSerial::rxChar( uint8_t c )
   PCINT_ISR(1, PINJ);
   PCINT_ISR(2, PINK);
 
+  #elif defined(__AVR_ATmega1281__)
+
+  PCINT_ISR(0, PINB);
+  // PCINT8 on PE0 not supported.  Other 7 are on PJ0..6
+  PCINT_ISR(1, PINJ);
+  PCINT_ISR(2, PINK);
+
   #elif defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644P__)
 
   PCINT_ISR(0, PINA);