Gemfile in chef-vault-2.8.0 vs Gemfile in chef-vault-2.9.0

@@ -1,5 +1,12 @@
 source "https://rubygems.org/"
 
-gem "chefstyle", git: "https://github.com/chef/chefstyle.git"
+group :development do
+  gem "chefstyle", git: "https://github.com/chef/chefstyle.git"
+end
+if RUBY_VERSION.to_f >= 2.0
+  group :changelog do
+    gem "github_changelog_generator", "1.11.3"
+  end
+end
 
 gemspec