Update repositories.txt (#6277)

Author: ahagelberg

repositories.txt

@@ -775,6 +775,7 @@ https://github.com/agdl/GoPRO
 https://github.com/agdl/WireUpdate
 https://github.com/aggregate/LCLV
 https://github.com/agmangas/SerialRFID
+https://github.com/ahagelberg/PropulsionStepper
 https://github.com/aharshac/EasyNTPClient
 https://github.com/aharshac/StringSplitter
 https://github.com/ahmedarif193/Hlw8032