Allow stripe gem version 13

Author: quezo

stripe-ruby-mock.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |gem|
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ['lib']
 
-  gem.add_dependency 'stripe', '> 5', '< 12'
+  gem.add_dependency 'stripe', '> 5', '< 14'
   gem.add_dependency 'multi_json', '~> 1.0'
   gem.add_dependency 'dante', '>= 0.2.0'