Fix segment related eslint violations

assets/js/src/segments/list.jsx

@@ -2,6 +2,7 @@ import React from 'react';
 import { Link } from 'react-router';
 import MailPoet from 'mailpoet';
 import classNames from 'classnames';
+import PropTypes from 'prop-types';
 
 import Listing from 'listing/listing.jsx';
 
@@ -276,4 +277,9 @@ class SegmentList extends React.Component {
   }
 }
 
+SegmentList.propTypes = {
+  location: PropTypes.object.isRequired, // eslint-disable-line react/forbid-prop-types
+  params: PropTypes.object.isRequired, // eslint-disable-line react/forbid-prop-types
+};
+
 module.exports = SegmentList;

assets/js/src/segments/segments.jsx

@@ -2,6 +2,7 @@ import React from 'react';
 import ReactDOM from 'react-dom';
 import { Router, Route, IndexRoute, useRouterHistory } from 'react-router';
 import { createHashHistory } from 'history';
+import PropTypes from 'prop-types';
 
 import SegmentList from 'segments/list.jsx';
 import SegmentForm from 'segments/form.jsx';
@@ -14,6 +15,10 @@ class App extends React.Component {
   }
 }
 
+App.propTypes = {
+  children: PropTypes.element.isRequired,
+};
+
 const container = document.getElementById('segments_container');
 
 if (container) {