This library has been archived and replaced by two new libraries, one for each sensor in the LSM303DLH:
https://github.com/adafruit/Adafruit_CircuitPython_LSM303_Accel https://github.com/adafruit/Adafruit_CircuitPython_LSM303DLH_Mag
This library is no longer supported. Please use the new libraries