message: remove unused html serializer
diff: @@ -145,7 +145,7 @@ export default class MessageComposerInput extends React.Component {
  this.plainWithIdPills = new PlainWithPillsSerializer({ pillFormat: 'id' });
  this.plainWithPlainPills = new PlainWithPillsSerializer({ pillFormat: 'plain' });
  this.md = new Md();
  - this.html = new Html();
  + //this.html = new Html(); // not used atm
  this.suppressAutoComplete = false;
  this.direction = '';
  