Merge pull request #2362 from slurpcode/dependabot/bundler/jekyll-ava…

…tar-and-activesupport-and-kramdown-and-jekyll-feed-and-jekyll-redirect-from-and-jekyll-sitemap-and-jemoji-and-github-pages-and-mdl-and-mechanize-and-minima-and-rubycritic-0.8.0

Bump jekyll-avatar, activesupport, kramdown, jekyll-feed, jekyll-redirect-from, jekyll-sitemap, jemoji, github-pages, mdl, mechanize, minima and rubycritic