Add mizoR as gem owner

exception_notification-slacky.gemspec

@@ -7,8 +7,8 @@ Gem::Specification.new do |spec|
   spec.name          = "exception_notification-slacky"
   spec.version       = ExceptionNotification::Slacky::VERSION
   spec.licenses      = ['MIT']
-  spec.authors       = ["森井ゴンザレス"]
-  spec.email         = ["[email protected]"]
+  spec.authors       = ["森井ゴンザレス", "Ryutaro Mizokami"]
+  spec.email         = ["[email protected]", "[email protected]"]
 
   spec.summary       = %q{Send Exception notification to slack}
   spec.description   = %q{Send Exception notification to slack. Works as ExceptionNotification Plugin.}