code: function(oldPassword, newPassword, options) {
          var route = 'users/' + this.id + '/updatePassword';
          var params = {
            old_password: oldPassword,
            new_password: newPassword,
          };
          var request = AVRequest(route, null, null, 'PUT', params, options);
          return request;
        }
docs: Update user's new password safely based on old password.
  @param {String} oldPassword the old password.
  @param {String} newPassword the new password.
  @param {AuthOptions} options