Update repositories.txt

Author: janscience

repositories.txt

@@ -3140,6 +3140,7 @@ https://github.com/janelia-arduino/TMC429
 https://github.com/janelia-arduino/Vector
 https://github.com/janelia-arduino/Watchdog
 https://github.com/janikheiler/Mintrix
+https://github.com/janscience/MicroConfig
 https://github.com/janscience/ESensors
 https://github.com/janscience/TeeRec
 https://github.com/janscience/TeeGrid