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README.md - added safety step when installing the pot wire

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@ -189,6 +189,9 @@ Soldering steps:
* solder the two ICS: U1 (digital pot) and U2 (shift register)
* solder the LED, the switch and the big capacitors
* **special step** solder a thin wire between the MT3608 module and the PCB hole marked as POT. See the image bellow.
* **Important** after you solder the wire measure the resistance between the wire's connection on Afterburner PCB and ground (use TP GND hole) - see red dots
on the picture beelow. It must be around 12.5 kilo Ohm. If it is very low value then you made a short while soldering the wire. Fix/remove the short
or else the MT3608 will be damaged when it is turned on on.
* solder the MT3608 module - the POT connection wire must be already soldered!
* calibrate the board. See calibration steps in the Setup section.
* solder the ZIF socket