rubocop 0.21に合わせて設定を修正
rubocop 0.21に合わせて設定を修正

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