async.gemspec in async-1.15.1 vs async.gemspec in async-1.15.2

@@ -25,9 +25,11 @@
 	spec.add_runtime_dependency "nio4r", "~> 2.3"
 	spec.add_runtime_dependency "timers", "~> 4.1"
 	
 	spec.add_development_dependency "async-rspec", "~> 1.1"
 	
+	spec.add_development_dependency "covered", "~> 0.10"
+	
 	spec.add_development_dependency "bundler"
 	spec.add_development_dependency "rspec", "~> 3.6"
 	spec.add_development_dependency "rake"
 end