exe/tf_mux in mux_tf-0.13.0 vs exe/tf_mux in mux_tf-0.14.0

@@ -9,9 +9,11 @@
 
   MuxTf::Cli.run(:mux, ARGV)
 rescue Interrupt
   warn "\nInterrupted"
   exit 1
+rescue SystemExit => e
+  exit e.status
 rescue Exception => e # rubocop:disable Lint/RescueException
   warn e.full_message
   warn "<press enter>"
   $stdin.gets
   exit 1