Merge pull request #3 from adafruit/magnetometer_fix

fixing magnetometer for issue #1

Author: siddacious

adafruit_lis3mdl.py

@@ -72,7 +72,7 @@
 _LIS3MDL_INT_CFG = const(0x30)   # Interrupt configuration register
 _LIS3MDL_INT_THS_L = const(0x32) # Low byte of the irq threshold
 
-_GAUSS_TO_MT = 0.1 #1 Gauss [G] =   0.1 Millitesla [mT]
+_GAUSS_TO_UT = 100
 
 class CV:
     """struct helper"""
@@ -233,7 +233,7 @@ def magnetic(self):
         return(x, y, z)
 
     def _scale_mag_data(self, raw_measurement): #pylint: disable=no-self-use
-        return (raw_measurement / Range.lsb[self.range]) * _GAUSS_TO_MT
+        return (raw_measurement / Range.lsb[self.range]) * _GAUSS_TO_UT
 
     @property
     def range(self):