byebug is supported on MRI 2.0, 2.1 only

mtodd · mtodd · commit 34d63f6f9f74 · 2014-10-06T15:14:28.000-07:00
diff --git a/Gemfile b/Gemfile
@@ -4,5 +4,5 @@ source 'https://rubygems.org'
 gemspec
 
 group :test, :development do
-  gem "byebug"
+  gem "byebug", :platforms => [:mri_20, :mri_21]
 end
