added shebang line to example.py

example.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from hx711 import HX711		# import the class HX711
 import RPi.GPIO as GPIO		# import GPIO
 import time
@@ -8,7 +9,7 @@
 	# If you do not pass any argument 'gain_channel_A' then the default value is 128
 	# If you do not pass any argument 'set_channel' then the default value is 'A'
 	# you can set a gain for channel A even though you want to currently select channel B
-	hx = HX711(dout_pin=20, pd_sck_pin=21, gain_channel_A=128, select_channel='B')
+	hx = HX711(dout_pin=21, pd_sck_pin=20, gain_channel_A=128, select_channel='B')
 
 	result = hx.reset()		# Before we start, reset the hx711 ( not necessary)
 	if result:			# you can check if the reset was successful