Pin jekyll version and remove decaration of transitive dependencies

Author: sdruskat

Gemfile

@@ -7,9 +7,7 @@ gem 'wdm', '~> 0.1.1' if Gem.win_platform?
 
 gem 'rake'
 
-gem 'jekyll'
-gem 'liquid', '>= 5.5.0'
-gem "kramdown", ">= 2.3.0"
+gem 'jekyll', ">= 4.4.1"
 gem 'jekyll-feed', group: :jekyll_plugins
 gem 'jekyll-redirect-from', group: :jekyll_plugins
 gem "kramdown-parser-gfm"