Entity sensor.muellabfuhr implements device_state_attributes warning

[geektoor]

Hey,

i just noticed the following warning:
WARNING (MainThread) [homeassistant.helpers.entity] Entity sensor.muellabfuhr (<class 'custom_components.abfallapi_jumomind.sensor.JumomindAbfallSensor'>) implements device_state_attributes. Please report it to the custom component author.

According to this posting, it might(!) be an easy fix:
https://community.home-assistant.io/t/warning-that-custom-component-is-using-device-state-attributes/376020

But i have no idea about it, so i can't provide much more than this for now.

Cheers and thanks for the sensor so far :)