private_class_method raises error

[stevenspiel]

A valid syntax for later versions of ruby and private class methods is:

private_class_method def foo
  puts 'bar'
end

That raises an error with yardstick:

NameError: uninitialized constant YARD::Handlers::Ruby::PrivateClassMethodHandler::NamespaceMissingError

in method:

ruby-2.3.1/gems/yard-0.8.7.6/lib/yard/handlers/ruby/private_class_method_handler.rb:43:in `rescue in privatize_class_method'