Remove use of deprecated React.PropTypes

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

src/components/structures/MatrixChat.js

@@ -19,6 +19,7 @@ limitations under the License.
 import Promise from 'bluebird';
 
 import React from 'react';
+import PropTypes from 'prop-types';
 import Matrix from "matrix-js-sdk";
 
 import Analytics from "../../Analytics";
@@ -92,38 +93,38 @@ export default React.createClass({
     displayName: 'MatrixChat',
 
     propTypes: {
-        config: React.PropTypes.object,
-        ConferenceHandler: React.PropTypes.any,
-        onNewScreen: React.PropTypes.func,
-        registrationUrl: React.PropTypes.string,
-        enableGuest: React.PropTypes.bool,
+        config: PropTypes.object,
+        ConferenceHandler: PropTypes.any,
+        onNewScreen: PropTypes.func,
+        registrationUrl: PropTypes.string,
+        enableGuest: PropTypes.bool,
 
         // the queryParams extracted from the [real] query-string of the URI
-        realQueryParams: React.PropTypes.object,
+        realQueryParams: PropTypes.object,
 
         // the initial queryParams extracted from the hash-fragment of the URI
-        startingFragmentQueryParams: React.PropTypes.object,
+        startingFragmentQueryParams: PropTypes.object,
 
         // called when we have completed a token login
-        onTokenLoginCompleted: React.PropTypes.func,
+        onTokenLoginCompleted: PropTypes.func,
 
         // Represents the screen to display as a result of parsing the initial
         // window.location
-        initialScreenAfterLogin: React.PropTypes.shape({
-            screen: React.PropTypes.string.isRequired,
-            params: React.PropTypes.object,
+        initialScreenAfterLogin: PropTypes.shape({
+            screen: PropTypes.string.isRequired,
+            params: PropTypes.object,
         }),
 
         // displayname, if any, to set on the device when logging
         // in/registering.
-        defaultDeviceDisplayName: React.PropTypes.string,
+        defaultDeviceDisplayName: PropTypes.string,
 
         // A function that makes a registration URL
-        makeRegistrationUrl: React.PropTypes.func.isRequired,
+        makeRegistrationUrl: PropTypes.func.isRequired,
     },
 
     childContextTypes: {
-        appConfig: React.PropTypes.object,
+        appConfig: PropTypes.object,
     },
 
     AuxPanel: {