rscons.gemspec in rscons-1.7.0 vs rscons.gemspec in rscons-1.8.0

@@ -22,7 +22,8 @@
 
   gem.add_development_dependency "rspec"
   gem.add_development_dependency "rake"
   gem.add_development_dependency "simplecov"
   gem.add_development_dependency "yard"
+  gem.add_development_dependency "rdoc"
   gem.add_development_dependency "redcarpet"
 end