Update repositories.txt

Arduino library for I2C DAC53001 10 bit DAC.

Author: RobTillaart

repositories.txt

@@ -5423,6 +5423,7 @@ https://github.com/RobTillaart/DAC8554
 https://github.com/RobTillaart/DAC8560
 https://github.com/RobTillaart/DAC8571
 https://github.com/RobTillaart/DAC8574
+https://github.com/RobTillaart/DAC53001
 https://github.com/RobTillaart/dateTimeHelpers
 https://github.com/RobTillaart/DEVFULL
 https://github.com/RobTillaart/DEVNULL