fix(ui): Fix UI export (#492)

Author: joshfrench

src/js/index.js

@@ -1,5 +1,5 @@
 import Editor from './editor/editor';
-import UI from './editor/ui';
+import * as UI from './editor/ui';
 import ImageCard from './cards/image';
 import Range from './utils/cursor/range';
 import Position from './utils/cursor/position';