Remove sudo from Travis CI tutorial (#8187)
Remove sudo from Travis CI tutorial (#8187)

Merge pull request 8187
jekyll/jekyll,x-way/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,ryanshaw/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,chrisfinazzo/jekyll,fulldecent/jekyll,x-way/jekyll,jaybe-jekyll/jekyll,jaybe-jekyll/jekyll,jaybe-jekyll/jekyll,jekyll/jekyll,ryanshaw/jekyll,jekyll/jekyll,ryanshaw/jekyll,ryanshaw/jekyll,jekyll/jekyll,chrisfinazzo/jekyll,x-way/jekyll,x-way/jekyll,yhironaka/yhironaka.github.io