fixed demo program.
fixed demo program.

smalruby/smalruby-editor,takaokouji/smalruby-editor,Ikuyadeu/smalruby-editor,Ikuyadeu/smalruby-editor,Ikuyadeu/smalruby-editor,smalruby/smalruby-editor,takaokouji/smalruby-editor,smalruby/smalruby-editor,takaokouji/smalruby-editor