Merge pull request #9 from squanto/master

adds rack dependency

Author: puneet-khushwani-eth

ost-sdk-ruby.gemspec

@@ -22,6 +22,8 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
+  spec.add_dependency "rack", "~> 2.0"
+
   spec.add_development_dependency "bundler", "~> 1.6"
   spec.add_development_dependency "rake", '~> 2.0.4'