async-container.gemspec in async-container-0.3.0 vs async-container.gemspec in async-container-0.4.0

@@ -20,9 +20,11 @@
 	spec.has_rdoc      = "yard"
 	
 	spec.required_ruby_version = "~> 2.0"
 
 	spec.add_runtime_dependency "async", "~> 1.0"
+	spec.add_runtime_dependency "async-io", "~> 1.4"
+	
 	spec.add_development_dependency "async-rspec", "~> 1.1"
 	
 	spec.add_development_dependency "bundler", "~> 1.3"
 	spec.add_development_dependency "rspec", "~> 3.6"
 	spec.add_development_dependency "rake"