xi.gemspec in xi-lang-0.2.1 vs xi.gemspec in xi-lang-0.2.2

- old
+ new

@@ -26,9 +26,10 @@
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"
   spec.add_development_dependency "pry-byebug"
   spec.add_development_dependency "guard"
   spec.add_development_dependency "guard-minitest"
+  spec.add_development_dependency "yard"
 
   spec.add_dependency 'pry'
   spec.add_dependency 'osc-ruby'
 end