little bug in kamstrup usage simulator

[cancantian]

def _get_energy_in_lowres(self):
return self.energy_in / 1000

def _get_energy_out_lowres(self):
    return self.energy_out / 1000

In Python 3 the / operator is a floating point division, // for integer division.
this will cause typeError in message.py
low_endian_value_packed.append(register_value & 0xFF)

[glaslos]

@cancantian nice catch! Do you want to create a pull request to fix the issue?