smail.gemspec in s_mail-0.1.2 vs smail.gemspec in s_mail-0.1.3

@@ -34,6 +34,7 @@
   spec.require_paths = ["lib"]
 
   spec.add_development_dependency "bundler", "~> 1.15"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"
+  spec.add_runtime_dependency 'mail', '>= 2.0'
 end