message: Removes deprecated exit code in 'spfx project upgrade'. Closes
diff: @@ -153,8 +153,6 @@ class SpfxProjectUpgradeCommand extends BaseProjectCommand {
  public static ERROR_NO_VERSION: number = 3;
  public static ERROR_UNSUPPORTED_FROM_VERSION: number = 4;
  public static ERROR_NO_DOWNGRADE: number = 5;
  - // no longer used. Left for backwards-compatibility
  - public static ERROR_PROJECT_UP_TO_DATE: number = 6;
  public get name(): string {
  return commands.PROJECT_UPGRADE;
  