Gemfile in kindlegen-2.9.0 vs Gemfile in kindlegen-2.9.1

@@ -1,4 +1,8 @@
-source "http://rubygems.org"
+source 'https://rubygems.org'
 
 # Specify your gem's dependencies in kindlegen.gemspec
 gemspec
+
+group :development do
+  gem 'rake'
+end