Kill trailing whitespace in ruby files

app/mailers/user_mailer.rb

@@ -3,13 +3,13 @@ class UserMailer < ActionMailer::Base
 
   def dmail_notice(dmail)
     @dmail = dmail
-    mail(:to => "#{dmail.to.name} <#{dmail.to.email}>", :subject => "#{Danbooru.config.app_name} - Message received from #{dmail.from.name}")    
+    mail(:to => "#{dmail.to.name} <#{dmail.to.email}>", :subject => "#{Danbooru.config.app_name} - Message received from #{dmail.from.name}")
   end
-  
+
   def upgrade(user, email)
     mail(:to => "#{user.name} <#{email}>", :subject => "#{Danbooru.config.app_name} account upgrade")
   end
-  
+
   def upgrade_fail(email)
     mail(:to => "#{user.name} <#{email}>", :subject => "#{Danbooru.config.app_name} account upgrade")
   end