Update repositories.txt (#5653)

Author: dndubins

repositories.txt

@@ -2110,6 +2110,7 @@ https://github.com/dmkishi/Dusk2Dawn
 https://github.com/DmytroKorniienko/EmbUI
 https://github.com/dndg/Finder6M
 https://github.com/dndg/Finder7M
+https://github.com/dndubins/tinyServo84
 https://github.com/dndubins/EEPROMsimple
 https://github.com/dndubins/QuickStats
 https://github.com/dndubins/SRAMsimple