Update repositories.txt

Add https://github.com/RobTillaart/rotaryDecoderSwitch5 
a PCF8575 based library for up to 5 rotary endcoders

Author: RobTillaart

repositories.txt

@@ -5537,6 +5537,7 @@ https://github.com/RobTillaart/relativity
 https://github.com/RobTillaart/rotaryDecoder
 https://github.com/RobTillaart/rotaryDecoder8
 https://github.com/RobTillaart/rotaryDecoderSwitch
+https://github.com/RobTillaart/rotaryDecoderSwitch5
 https://github.com/RobTillaart/RS485
 https://github.com/RobTillaart/RunAvgWeight
 https://github.com/RobTillaart/runningAngle