dogviz.gemspec in dogviz-0.0.4 vs dogviz.gemspec in dogviz-0.0.5

@@ -19,8 +19,9 @@
 
   spec.add_development_dependency "bundler", "~> 1.10"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency 'simplecov', '~> 0'
   spec.add_development_dependency 'colorize', '~> 0'
+  spec.add_development_dependency 'nokogiri', '~> 1.6'
 
   spec.add_dependency 'ruby-graphviz', '~> 1'
 end