Add https://github.com/mathieucarbou/MycilaUtilities (#4851)

Author: mathieucarbou

repositories.txt

@@ -3894,6 +3894,7 @@ https://github.com/mathieucarbou/MycilaRelay
 https://github.com/mathieucarbou/MycilaTaskManager
 https://github.com/mathieucarbou/MycilaTaskMonitor
 https://github.com/mathieucarbou/MycilaTrial
+https://github.com/mathieucarbou/MycilaUtilities
 https://github.com/mathieucarbou/MycilaWebSerial
 https://github.com/mathworks/thingspeak-arduino
 https://github.com/matmunk/DS18B20