Update README.md

Author: HAEdwin

README.md

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 ![Home Assistant Dashboard](https://github.com/HAEdwin/homeassistant-apsystems_ecu_proxy/blob/main/impression.jpg)
 # APsystems ECU Proxy
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-### 🔴 This integration is under construction
 Works and tested with the ECU-R (2160....) if the integration works for your ECU model, please let me know which model you own!
 The integration is not compatible with the ECU-C https://github.com/HAEdwin/homeassistant-apsystems_ecu_proxy/issues/2.