Increase interval for sensor while testing

Avoids error that occurs when handling large amount
of sensor data.  In future, might be interesting to
see if we can support faster UART baud rate.

Author: chrisruk

test/color.py

@@ -34,7 +34,7 @@ def test_caching(self):
         """Test to make sure we're not reading cached data"""
         color = ColorSensor('A')
         color.avg_reads = 1
-        color.interval = 1
+        color.interval = 10
 
         for _ in range(100):
             color.mode(2)