Update README.md

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@ -149,8 +149,8 @@ Pin FUNCTION
1 VCC (3.3v constant) 1 VCC (3.3v constant)
2 GND (continuity to DC negative) 2 GND (continuity to DC negative)
3 TX (3.3v high, fluctuating during transmission, dead when unpowered) 3 TX (3.3v high, fluctuating during transmission while device is powered, dead when device is unpowered)
4 RX (3.3v high, fluctuating during transmission, dead when unpowered) 4 RX (3.3v high, fluctuating during transmission while UART device powered, dead when UART device unpowered)
Note: this has been verified with a multimeter, it is the most common used pinout layout Note: this has been verified with a multimeter, it is the most common used pinout layout