bin/trema in trema-0.4.8 vs bin/trema in trema-0.5.0

@@ -2,10 +2,11 @@
 $LOAD_PATH.unshift File.join(File.dirname(__FILE__), '..', 'lib')
 
 require 'drb/drb'
 require 'gli'
 require 'phut'
+require 'pio'
 require 'rake'
 require 'trema'
 
 ENV['GLI_DEBUG'] = 'true'
 
@@ -45,10 +46,10 @@
 
       c.action do |global_options, options, args|
         Phut.pid_dir = options[:pid_dir]
         Phut.log_dir = options[:log_dir]
         Phut.socket_dir = options[:socket_dir]
-        require 'pio/open_flow13' if options[:openflow13]
+        Pio::OpenFlow.switch_version 'OpenFlow13' if options[:openflow13]
         require 'trema/switch'
         Trema::Command.new.run(args, global_options.merge(options))
       end
     end