Change ESLint error to warning

src/browser/components/NewTeamModal.jsx

@@ -1,6 +1,9 @@
 // Copyright (c) 2015-2016 Yuya Ochiai
 // Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.
+
+/* eslint react/no-deprecated: 1 */
+
 import React from 'react';
 import PropTypes from 'prop-types';
 import {Modal, Button, FormGroup, FormControl, ControlLabel, HelpBlock} from 'react-bootstrap';