v0.4.0

This adds a new method: get_remaining_charge which returns a list of values of the battery's remaining charge (in kWh).

• Also some breaking rename changes:
  • get_solar_generation_data is now get_solar_generation
  • latest_solar_generation_data is now latest_solar_generation
  • get_house_data is now get_house_consumption
  • latest_house_data is now latest_house_consumption

These renames were to make the methods more descriptive and meaningful.