Unpin bundler version.

Author: ioquatix

async-rspec.gemspec

@@ -22,6 +22,6 @@ Gem::Specification.new do |spec|
 spec.add_development_dependency "async", "~> 1.8"
 
 spec.add_development_dependency "covered"
-spec.add_development_dependency "bundler", "~> 1.13"
+spec.add_development_dependency "bundler"
 spec.add_development_dependency "rake", "~> 10.0"
 end