Merge pull request #4313 from matrix-org/travis/react-warnings/1-componentDidMount

Use componentDidMount in place of componentWillMount where possible

src/components/views/auth/CountryDropdown.js

@@ -60,7 +60,7 @@ export default class CountryDropdown extends React.Component {
         };
     }
 
-    componentWillMount() {
+    componentDidMount() {
         if (!this.props.value) {
             // If no value is given, we start with the default
             // country selected, but our parent component

src/components/views/auth/InteractiveAuthEntryComponents.js

@@ -465,7 +465,7 @@ export const MsisdnAuthEntry = createReactClass({
         };
     },
 
-    componentWillMount: function() {
+    componentDidMount: function() {
         this._submitUrl = null;
         this._sid = null;
         this._msisdn = null;