Heartbeat for ATtiny85 by Theomachist

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Adapted from code found at several forums and small bits of the ArduinoISP sketch, this program causes an LED on pin A0 to pulse like a heartbeat. An effective, easy to implement method of verifying that your loop() is still active. Also very effective for demonstrating that your ATmega### is still alive if you're as bored of "Blink" as I am.