Fix offenses detected by rubocop-performance-1.4.0
Fix offenses detected by rubocop-performance-1.4.0

x-way/jekyll,chrisfinazzo/jekyll,jekyll/jekyll,x-way/jekyll,ryanshaw/jekyll,x-way/jekyll,Strangehill/jekyll,jaybe-jekyll/jekyll,ryanshaw/jekyll,x-way/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,jekyll/jekyll,Strangehill/jekyll,tillgrallert/jekyll,tillgrallert/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,tillgrallert/jekyll,fulldecent/jekyll,fulldecent/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,chrisfinazzo/jekyll,jekyll/jekyll,tillgrallert/jekyll,Strangehill/jekyll,ryanshaw/jekyll,chrisfinazzo/jekyll,jekyll/jekyll,ryanshaw/jekyll,chrisfinazzo/jekyll,Strangehill/jekyll,tillgrallert/jekyll,yhironaka/yhironaka.github.io