Update README.md

hamsolo474 · hamsolo474 · commit 70dfb309a8bd · 2014-10-26T03:49:29.000+11:00
example didnt set the pinmode for pin 13 before attempting to write values to it
diff --git a/README.md b/README.md
@@ -24,6 +24,7 @@ from Arduino import Arduino
 import time
 
 board = Arduino('9600') #plugged in via USB, serial com at rate 9600
+board.pinMode(13, "OUTPUT")
 
 while True:
     board.digitalWrite(13, "LOW")
