Moved propTypes and defaultProps as static properties in class components

src/common/MenuLayout.js

@@ -17,14 +17,14 @@ import TagsList from '../tags/TagsList';
 import { serverType } from '../servers/prop-types';
 import AsideMenu from './AsideMenu';
 
-const propTypes = {
-  match: PropTypes.object,
-  selectServer: PropTypes.func,
-  location: PropTypes.object,
-  selectedServer: serverType,
-};
-
 export class MenuLayoutComponent extends React.Component {
+  static propTypes = {
+    match: PropTypes.object,
+    selectServer: PropTypes.func,
+    location: PropTypes.object,
+    selectedServer: serverType,
+  };
+
   state = { showSideBar: false };
 
   // FIXME Shouldn't use componentWillMount, but this code has to be run before children components are rendered
@@ -105,8 +105,6 @@ export class MenuLayoutComponent extends React.Component {
   }
 }
 
-MenuLayoutComponent.propTypes = propTypes;
-
 const MenuLayout = compose(
   connect(pick([ 'selectedServer', 'shortUrlsListParams' ]), { selectServer }),
   withRouter