Update repositories.txt - Add MCAnemometer-Ultrasonic (#6386)

Author: EatingJan1

repositories.txt

@@ -7965,6 +7965,7 @@ https://github.com/Port-Net/MLX90377_SENT
 https://github.com/eccentricOrange/BIDFestTools
 https://github.com/dzalf/EEPROM_UID
 https://github.com/EatingJan1/MCHyetometer-REED
+https://github.com/EatingJan1/MCAnemometer-Ultrasonic
 https://github.com/4211421036/YFS201
 https://github.com/nikachu2012/HttpCall
 https://github.com/AudunKodehode/JC3248W535EN-Touch-LCD