add lib (#6708)

* Update repositories.txt

* Update repositories.txt

* Update repositories.txt

* Update repositories.txt

* Update repositories.txt

* Update repositories.txt

* Update repositories.txt

Author: GyverLibs

repositories.txt

@@ -2926,6 +2926,7 @@ https://github.com/gvandersel/SXAccessoire
 https://github.com/GypsyRobot/CuteBuzzerSounds
 https://github.com/GypsyRobot/Formulinha
 https://github.com/GypsyRobot/MusicBuzzer
+https://github.com/GyverLibs/uButton
 https://github.com/GyverLibs/GyverPing
 https://github.com/GyverLibs/GyverMenu
 https://github.com/GyverLibs/GVector