async.gemspec in async-0.13.0 vs async.gemspec in async-0.14.0

@@ -19,15 +19,16 @@
 	spec.executables   = spec.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
 	spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
 	spec.require_paths = ["lib"]
 	spec.has_rdoc      = "yard"
 	
-	spec.required_ruby_version = ">= 2.0.0"
+	spec.required_ruby_version = "~> 2.0"
 
 	spec.add_runtime_dependency "nio4r"
 	spec.add_runtime_dependency "timers", "~> 4.1"
 	
+	spec.add_development_dependency "async-rspec", "~> 1.0"
+	
 	spec.add_development_dependency "bundler", "~> 1.3"
-	spec.add_development_dependency "process-daemon", "~> 1.0.0"
-	spec.add_development_dependency "rspec", "~> 3.4.0"
+	spec.add_development_dependency "rspec", "~> 3.4"
 	spec.add_development_dependency "rake"
 end