update rails-html-sanitizer to 1.0.4 because of CVE-2018-3741
update rails-html-sanitizer to 1.0.4 because of CVE-2018-3741

COSMOSMagazine/spina_summernote,COSMOSMagazine/spina_summernote,COSMOSMagazine/spina_summernote