Relax version constraint for kramdown to support latest version of github-pages (daattali#1290)

Author: pedantic-git

beautiful-jekyll-theme.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "jekyll-paginate", "~> 1.1"
   spec.add_runtime_dependency "jekyll-sitemap", "~> 1.4"
   spec.add_runtime_dependency "kramdown-parser-gfm", "~> 1.1"
-  spec.add_runtime_dependency "kramdown", "~> 2.3.2"
+  spec.add_runtime_dependency "kramdown", "~> 2.3"
   spec.add_runtime_dependency "webrick", "~> 1.8"
 
   spec.add_development_dependency "bundler", ">= 1.16"