Remove use of deprecated React.PropTypes

Replace all uses of React.PropTypes with PropTypes and importing PropTypes from
'prop-types'.

src/components/views/rooms/RoomHeader.js

@@ -17,6 +17,7 @@ limitations under the License.
 'use strict';
 
 import React from 'react';
+import PropTypes from 'prop-types';
 import classNames from 'classnames';
 import sdk from '../../../index';
 import { _t } from '../../../languageHandler';
@@ -39,18 +40,18 @@ module.exports = React.createClass({
     displayName: 'RoomHeader',
 
     propTypes: {
-        room: React.PropTypes.object,
-        oobData: React.PropTypes.object,
-        editing: React.PropTypes.bool,
-        saving: React.PropTypes.bool,
-        inRoom: React.PropTypes.bool,
-        collapsedRhs: React.PropTypes.bool,
-        onSettingsClick: React.PropTypes.func,
-        onPinnedClick: React.PropTypes.func,
-        onSaveClick: React.PropTypes.func,
-        onSearchClick: React.PropTypes.func,
-        onLeaveClick: React.PropTypes.func,
-        onCancelClick: React.PropTypes.func,
+        room: PropTypes.object,
+        oobData: PropTypes.object,
+        editing: PropTypes.bool,
+        saving: PropTypes.bool,
+        inRoom: PropTypes.bool,
+        collapsedRhs: PropTypes.bool,
+        onSettingsClick: PropTypes.func,
+        onPinnedClick: PropTypes.func,
+        onSaveClick: PropTypes.func,
+        onSearchClick: PropTypes.func,
+        onLeaveClick: PropTypes.func,
+        onCancelClick: PropTypes.func,
     },
 
     getDefaultProps: function() {