Fixed main reference to tsl2561 class

Author: IainColledge

Adafruit_TSL2561/Adafruit_TSL2561.py

@@ -510,7 +510,7 @@ def calculateAvgLux(self, testavg=TSL2561_NO_OF_AVG_SAMPLES):
                 return (luxavg)
 
 if __name__ == "__main__":
-    LightSensor = Adafruit_TSL2651()
+    LightSensor = Adafruit_TSL2561()
     LightSensor.enableAutoGain(True)
 
     # See if "loop" has been passed as an arg.