async.gemspec in async-1.11.0 vs async.gemspec in async-1.12.0

- old
+ new

@@ -25,9 +25,9 @@
 	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 "bundler", "~> 1.3"
+	spec.add_development_dependency "bundler"
 	spec.add_development_dependency "rspec", "~> 3.6"
 	spec.add_development_dependency "rake"
 end