add format as a hint how to change the format
add format as a hint how to change the format

minimo/github-preview,kei-s/github-preview,togusafish/kei-s-_-github-preview,minimo/github-preview,kei-s/github-preview,kei-s/github-preview,togusafish/kei-s-_-github-preview,minimo/github-preview,togusafish/kei-s-_-github-preview