message: Fix quote post slate update
  Missed API update
diff: @@ -428,7 +428,7 @@ export default class MessageComposerInput extends React.Component {
  this.onChange(change);
  } else {
  let fragmentChange = fragment.change();
  - fragmentChange.moveToRangeOf(fragment.document)
  + fragmentChange.moveToRangeOfNode(fragment.document)
  .wrapBlock(quote);
  // FIXME: handle pills and use commonmark rather than md-serialize
  