Add support for NC 28

Signed-off-by: Glandos <bugs-github@antipoul.fr>

Author: Glandos

appinfo/info.xml

@@ -33,6 +33,6 @@ Read the [documentation](https://github.com/nextcloud/user_external#readme) to l
 	<bugs>https://github.com/nextcloud/user_external/issues</bugs>
 	<repository type="git">https://github.com/nextcloud/user_external.git</repository>
 	<dependencies>
-		<nextcloud min-version="25" max-version="27" />
+		<nextcloud min-version="25" max-version="28" />
 	</dependencies>
 </info>