Use #notice instead of #err for realtime message (#26)

Author: raphink

lib/puppet/face/catalog/diff.rb

@@ -110,7 +110,7 @@
     when_invoked do |catalog1, catalog2, options|
       require File.expand_path(File.join(File.dirname(__FILE__), '..', '..', 'catalog-diff', 'differ.rb'))
       require File.expand_path(File.join(File.dirname(__FILE__), '..', '..', 'catalog-diff', 'findcatalogs.rb'))
-      Puppet.err('Add --debug for realtime output, add --render-as {json,yaml} for parsed output')
+      Puppet.notice('Add --debug for realtime output, add --render-as {json,yaml} for parsed output')
 
       # raise "You must pass unique paths to the arguments (#{catalog1} = #{catalog2})" if catalog1 == catalog2