barnes.gemspec in barnes-0.0.6 vs barnes.gemspec in barnes-0.0.7

@@ -24,9 +24,10 @@
   spec.add_runtime_dependency 'statsd-ruby', '~> 1.1'
   spec.required_ruby_version = '>= 2.2.0'
 
   spec.add_runtime_dependency 'multi_json', '~> 1'
 
+  spec.add_development_dependency 'rack',     '~> 2'
   spec.add_development_dependency 'rake',     '~> 10'
   spec.add_development_dependency 'minitest', '~> 5.3'
   spec.add_development_dependency "bundler",  '~> 1.15'
   spec.add_development_dependency "puma",     '~> 3.11'
   spec.add_development_dependency "wait_for_it",     '~> 0.1'