Update repositories.txt (#5314)

Add Naguissa/uConfigLib library

Author: Naguissa

repositories.txt

@@ -4326,6 +4326,7 @@ https://github.com/Naguissa/uTimerBrokerLib
 https://github.com/Naguissa/uUnixDate
 https://github.com/Naguissa/uHexLib
 https://github.com/Naguissa/uMessagesBrokerLib
+https://github.com/Naguissa/uConfigLib
 https://github.com/naiithink/musicians-mate
 https://github.com/nailujx86/ESP8266_multipart
 https://github.com/namino-cc/Namino_Library