Added grape-swagger to dependencies

Author: radanisk

grape-swagger-rails.gemspec

@@ -22,4 +22,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'railties', '~> 3.2.13'
   spec.add_development_dependency 'rubyzip', '~> 0.9.9'
+  spec.add_development_dependency 'grape-swagger', '~> 0.5.0'
 end