Update README.md

Signed-off-by: Va&Cob <ratthaninw@gmail.com>

Author: VaAndCob

sketch/firmware/README.md

@@ -10,4 +10,6 @@ there are 3 compiled firmware version
 
 
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-You can flash firmware with web flasher tool -> https://vaandcob.github.io/ESP32-OBD2-Gauge/sketch/firmware/webinstall.html
+You can flash firmware with web flasher tool -> 
+https://vaandcob.github.io/webflasher/flasher/webflasher.html
+https://vaandcob.github.io/ESP32-OBD2-Gauge/sketch/firmware/webinstall.html