Gemfile in pdksync-0.5.0 vs Gemfile in pdksync-0.6.0

@@ -1,9 +1,13 @@
 source "https://rubygems.org"
 
-git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in pdksync.gemspec
 gemspec
 
-gem 'github_changelog_generator', git: 'https://github.com/skywinder/github-changelog-generator', ref: 'master'
+gem 'github_changelog_generator', '~> 1.15'
 gem 'travis'
+
+group :development do
+  gem 'rb-readline', require: true
+end