Update README.md

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@ -22,7 +22,7 @@ pin | function
1 | +5V (250mA)
2 | 0-5V TX (from heatpump)
3 | 0-5V RX (to heatpump)
4 | +12V (250mA)
4 | NC (not connected)
5 | GND
## ESPHome example yaml code