Update dependency jekyll to v4

renovate-bot · renovate-bot · commit 2694c946884e · 2019-12-22T00:55:32.000Z
diff --git a/Gemfile b/Gemfile
@@ -6,7 +6,7 @@ git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 # gem "rails"
 
-gem "jekyll", "~> 3.8"
+gem "jekyll", "~> 4.0"
 
 gem "jekyll-paginate-v2", "~> 2.0"
 
