Fix #976: update build status badge

Author: terrillmoore

README.md

@@ -1,6 +1,6 @@
 # Arduino-LMIC library ("MCCI LoRaWAN LMIC Library")
 
-[![GitHub release](https://img.shields.io/github/release/mcci-catena/arduino-lmic.svg)](https://github.com/mcci-catena/arduino-lmic/releases/latest) [![GitHub commits](https://img.shields.io/github/commits-since/mcci-catena/arduino-lmic/latest.svg)](https://github.com/mcci-catena/arduino-lmic/compare/v4.1.1...master) [![Arduino CI](https://img.shields.io/github/workflow/status/mcci-catena/arduino-lmic/Arduino%20CI)](https://github.com/mcci-catena/arduino-lmic/actions)
+[![GitHub release](https://img.shields.io/github/release/mcci-catena/arduino-lmic.svg)](https://github.com/mcci-catena/arduino-lmic/releases/latest) [![GitHub commits](https://img.shields.io/github/commits-since/mcci-catena/arduino-lmic/latest.svg)](https://github.com/mcci-catena/arduino-lmic/compare/v4.1.1...master) [![Arduino CI](https://img.shields.io/github/actions/workflow/status/mcci-catena/arduino-lmic/ci-arduinocli.yml?branch-master)](https://github.com/mcci-catena/arduino-lmic/actions)
 
 **Contents:**