Update repositories.txt (#3985)

Arduino library for mapping a float to a number of bits.

Author: RobTillaart

repositories.txt

@@ -4965,6 +4965,7 @@ https://github.com/RobTillaart/LUHN
 https://github.com/RobTillaart/M5ANGLE8
 https://github.com/RobTillaart/M5ROTATE8
 https://github.com/RobTillaart/M62429
+https://github.com/RobTillaart/map2bits
 https://github.com/RobTillaart/map2colour
 https://github.com/RobTillaart/MATRIX7219
 https://github.com/RobTillaart/MAX14661