message: improve mustache template
diff: @@ -14,7 +14,9 @@ export class {{classname}} {{#parent}}extends {{{parent}}} {{/parent}}{
  {{/vars}}
  constructor(input?: any) {
  -{{#parent}}super();{{/parent}}
  + {{#parent}}
  + super();
  + {{/parent}}
  if (input) {
  Object.assign(this, input);
  {{#vars}}
  