feat: search in ruby tab

Author: takaokouji

src/containers/ruby-tab.jsx

@@ -16,6 +16,7 @@ import RubyToBlocksConverterHOC from '../lib/ruby-to-blocks-converter-hoc.jsx';
 
 import 'ace-builds/src-noconflict/mode-ruby';
 import 'ace-builds/src-noconflict/theme-clouds';
+import 'ace-builds/src-noconflict/ext-searchbox';
 import 'ace-builds/src-noconflict/ext-language_tools';
 
 class RubyTab extends React.Component {