[rOCCI] Core updates (#18) - typo fixed

gistfile1.diff

diff --git a/lib/occi/infrastructure/resource_tpl.rb b/lib/occi/infrastructure/resource_tpl.rb
index d3d726a..67ec27b 100644
--- a/lib/occi/infrastructure/resource_tpl.rb
+++ b/lib/occi/infrastructure/resource_tpl.rb
@@ -4,7 +4,7 @@ module Occi
 
       extend Occi
 
-      def self.mixin
+      def self.mixins
         mixin = Occi::Core::Mixin.new('http://schemas.ogf.org/occi/infrastructure#', 'resource_tpl')
 
         mixin.title = "resource template"