Add bundler version dependency

Author: johansmitsnl

hyper-react.gemspec

@@ -30,6 +30,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'libv8', '~> 6.3.0'
   spec.add_dependency 'react-rails', '>= 2.4.0', '< 2.5.0'
 
+  spec.add_development_dependency 'bundler', '~> 1.16.0'
   spec.add_development_dependency 'chromedriver-helper'
   spec.add_development_dependency 'hyper-spec', React::VERSION
   spec.add_development_dependency 'jquery-rails'