message: Fixes output options for spfx project upgrade. Closes
diff: @@ -86,6 +86,10 @@ class SpfxProjectUpgradeCommand extends BaseProjectCommand {
  return 'Upgrades SharePoint Framework project to the specified version';
  }
  + protected get allowedOutputs(): string[] {
  + return ['json', 'text', 'md', 'tour'];
  + }
  +
  constructor() {
  super();
  @@ -129,7 +133,7 @@ class SpfxProjectUpgradeCommand extends BaseProjectCommand {
  this.options.forEach(o => {
  if (o.option.indexOf('--output') > -1) {
  - o.autocomplete = ['json', 'text', 'md', 'tour'];
  + o.autocomplete = this.allowedOutputs;
  }
  });
  }
  