Update README

Author: splitbrain

README

@@ -3,7 +3,7 @@ imgpaste Plugin for DokuWiki
 Add images via cut'n'paste
 
 All documentation for this plugin can be found at
-http://www.cosmocode.de
+https://www.dokuwiki.org/plugin:imgpaste
 
 If you install this plugin manually, make sure it is installed in
 lib/plugins/imgpaste/ - if the folder is called different it