Gemfile in sycamore-0.2.1 vs Gemfile in sycamore-0.3.0

@@ -1,7 +1,13 @@
 source 'https://rubygems.org'
 
 gemspec
 
+group :development do
+  gem 'guard-rspec'
+  gem 'listen', '< 3.1' # to circumvent the fail for Ruby 2.1 and Rubinius
+  gem 'pry'
+end
+
 group :test do
-  gem 'coveralls',  require: false, platform: :mri
+  gem 'coveralls', require: false, platform: :mri
 end