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Bienenwaage 5.0 backlog
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- Improve configuration section within README.rst.
- Pull all configuration variables like "Taragewicht_A"
  to the top of the sketch, always use uppercase letters.
- Improve configuration for weather underground.
- Extend DS18B20 subsystem to use an arbitrary number of sensors.
- Check if we can make this sketch compatible with ESP8266 again.
- Make ADC pin ``A0`` configurable.