Rails 5 before_filter deprecation

[jaredjackson]

before_filter is deprecated.

Line 13 in rails-xmlrpc/lib/action_controller/acts/rails_xmlrpc.rb is this:

before_filter(:add_method_handlers, :only => [:xe_index])

It should be updated to:

before_action(:add_method_handlers, :only => [:xe_index])