IR LED Pin

IR output pin for ATmega328 (Arduino Pro Micro) should be 3 as the code states instead of 9 on the schematics. I tested PIN 3 and it outputs the signal.
```
// Arduino Duemilanove, Diecimila, LilyPad, Mini, Fio, Nano, etc
// ATmega48, ATmega88, ATmega168, ATmega328
#else
  //#define IR_USE_TIMER1   // tx = pin 9
  #define IR_USE_TIMER2     // tx = pin 3

#endif
```