Gemfile in PageRankr-3.1.1 vs Gemfile in PageRankr-3.1.2

@@ -1,7 +1,8 @@
 source :gemcutter
 
 gemspec
 
 group :development do
-  gem 'ruby-debug19', :require => 'ruby-debug', :platforms => :mri_19
+  gem 'pry'
+  gem 'pry-nav'
 end
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