README: update package index file URL

Author: chronopoulos

README.md

@@ -3,7 +3,7 @@ Arduino boards package for Automato
 
 ## Installation Instructions
 1. Install [arduino-esp32](https://docs.espressif.com/projects/arduino-esp32/en/latest/installing.html)
-2. Add the [package index file](https://raw.githubusercontent.com/chronopoulos/automato-arduino/main/package_automato_index.json)
+2. Add the [package index file](https://raw.githubusercontent.com/InterstitialTech/automato-arduino/refs/heads/main/package_automato_index.json)
 to the Arduino IDE (File > Preferences > Additional Boards Manager URLs)
 3. Open the boards manager (Tools > Board > Boards Manager), type "automato", and click Install
 4. Confirm that it's working by compiling Blinky with the board set as "Automato Sensor Module"