README corrections
README corrections

driesdesmet/cmsplugin_headergallery,shagi/cmsplugin_gallery_filer,SocialSchools/cmsplugin_gallery,centralniak/cmsplugin_gallery,driesdesmet/cmsplugin_headergallery,heckfi/cmsplugin_gallery_filer,centralniak/cmsplugin_gallery,Alir3z4/cmsplugin-filery,heckfi/cmsplugin_gallery_filer,jasekz/cmsplugin-filery,SocialSchools/cmsplugin_gallery,shagi/cmsplugin_gallery_filer