Revert "update versions"

This reverts commit 8b36c0a.

Author: ylebre

solid/appinfo/info.xml

@@ -18,7 +18,7 @@ When you do this, the Solid App can store data in your Nextcloud account through
     <category>integration</category>
     <bugs>https://github.com/pdsinterop/solid-nextcloud/issues</bugs>
     <dependencies>
-        <nextcloud min-version="29" max-version="31"/>
+        <nextcloud min-version="28" max-version="30"/>
     </dependencies>
     <settings>
         <admin>OCA\Solid\Settings\SolidAdmin</admin>