Duplicated email recipients in the info box

app/models/dmsf_mailer.rb

@@ -1,7 +1,9 @@
+# encoding: utf-8
+#
 # Redmine plugin for Document Management System "Features"
 #
 # Copyright (C) 2011    Vít Jonáš <vit.jonas@gmail.com>
-# Copyright (C) 2011-14 Karel Pičman <karel.picman@kontron.com>
+# Copyright (C) 2011-15 Karel Pičman <karel.picman@kontron.com>
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License
@@ -114,7 +116,7 @@ class DmsfMailer < Mailer
       end
     end      
 
-    notify_members.collect { |m| m.user }
+    notify_members.collect { |m| m.user }.uniq
   end
         
 end