bugfix negative prices

Author: jsa91

README.md

@@ -39,13 +39,13 @@ IO12  MISO
 
 ## ESP32
 
-To use *kwh_display*, start by flashing the ESP32 with firmware `build-ESP32_GENERIC_250123.bin`, which is compiled from the [MicroPython](https://docs.micropython.org/en/latest/esp32/tutorial/intro.html) repository.
+To use *kwh_display*, start by flashing the ESP32 with firmware `build-ESP32_GENERIC_250127.bin`, which is compiled from the [MicroPython](https://docs.micropython.org/en/latest/esp32/tutorial/intro.html) repository.
 
 
 Erase and the flash the ESP32 using [esptool](https://github.com/espressif/esptool).
 
 ```
-esptool.py --port /dev/ttyUSB0 erase_flash && esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x1000 build-ESP32_GENERIC_250123.bin
+esptool.py --port /dev/ttyUSB0 erase_flash && esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x1000 build-ESP32_GENERIC_250127.bin
 ```
 
 Edit ```/kwh_display/config.json``` to match your preferred settings.