Fix dependencies

Author: radanisk

grape-swagger-rails.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'bundler', '~> 1.3'
   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'
+  spec.add_dependency 'railties', '~> 3.2.13'
+  spec.add_dependency 'rubyzip', '~> 0.9.9'
+  spec.add_dependency 'grape-swagger', '~> 0.5.0'
 end