code: public void logout(LogoutStatusListener callback) {
          ServerRequest req = new ServerRequestLogout(context_, callback);
          if (!req.constructError_ && !req.handleErrors(context_)) {
              handleNewRequest(req);
          }
      }
docs: <p>This method should be called if you know that a different person is about to use the app. For example,
  if you allow users to log out and let their friend use the app, you should call this to notify Branch
  to create a new user for this device. This will clear the first and latest params, as a new session is created.</p>
  
  @param callback An instance of {@link io.branch.referral.Branch.LogoutStatusListener} to callback with the logout operation status.