Gemfile in sycamore-0.3.0 vs Gemfile in sycamore-0.3.1

@@ -1,11 +1,10 @@
 source 'https://rubygems.org'
 
 gemspec
 
-group :development do
+group :debug 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