Update normalize.css to v7.0.0 (#6491)
Update normalize.css to v7.0.0 (#6491)

Merge pull request 6491
Strangehill/jekyll,ryanshaw/jekyll,jekyll/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,Strangehill/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,yhironaka/yhironaka.github.io,fulldecent/jekyll,getandpost/jekyll.github.io,ryanshaw/jekyll,tillgrallert/jekyll,chrisfinazzo/jekyll,ryanshaw/jekyll,chrisfinazzo/jekyll,jekyll/jekyll,jekyll/jekyll,x-way/jekyll,Strangehill/jekyll,Strangehill/jekyll,tillgrallert/jekyll,jaybe-jekyll/jekyll,x-way/jekyll,jekyll/jekyll,gencer/jekyll,getandpost/jekyll.github.io,gencer/jekyll,jaybe-jekyll/jekyll,chrisfinazzo/jekyll,getandpost/jekyll.github.io,Strangehill/jekyll,gencer/jekyll,tillgrallert/jekyll,tillgrallert/jekyll,gencer/jekyll,x-way/jekyll,gencer/jekyll,fulldecent/jekyll,tillgrallert/jekyll,fulldecent/jekyll,x-way/jekyll,jaybe-jekyll/jekyll