Update composer.json to add php-tidy (ext-tidy)
Update composer.json to add php-tidy (ext-tidy)

Should fix https://github.com/wallabag/wallabag/issues/3844 for milestone https://github.com/wallabag/wallabag/milestone/63.
wallabag/wallabag,wallabag/wallabag,wallabag/wallabag