refactored _parse_data function to use Python's built-in struct.unpack… (#73)
refactored _parse_data function to use Python's built-in struct.unpack… (#73)

* refactored _parse_data function to use Python's built-in struct.unpack function instead of doing the byte magic manually. Also added documentation of the data format

* fixed flake8 warning

open-homeautomation/miflora,open-homeautomation/miflora