Update README.md

README.md

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 <details>
-<summary markdown="span">🔸Zigbee2MQTT LXC </summary>
+<summary markdown="span">Zigbee2MQTT LXC </summary>
  
 <p align="center"><img src="https://github.com/Koenkk/zigbee2mqtt/blob/master/images/logo.png?raw=true" alt="logo.png" width="100" height="100"/></p>