Added Ruby Gems
Added Ruby Gems

Added
  - jekyll-sitemap
  - jekyll-seo-tag
  - jekyll-mentions
  - jemoji
to my ruby gems in use
isabellareiff/isabellareiff.github.io,isabellareiff/isabellareiff.github.io,isabellareiff/isabellareiff.github.io,isabellareiff/isabellareiff.github.io