convert editor component registry to Map

src/components/Widgets/MarkdownControlElements/Toolbar/Toolbar.js

@@ -18,7 +18,7 @@ export default class Toolbar extends React.Component {
     onLink: PropTypes.func.isRequired,
     onToggleMode: PropTypes.func.isRequired,
     rawMode: PropTypes.bool,
-    plugins: ImmutablePropTypes.listOf(ImmutablePropTypes.record),
+    plugins: ImmutablePropTypes.map,
     onSubmit: PropTypes.func.isRequired,
     onAddAsset: PropTypes.func.isRequired,
     onRemoveAsset: PropTypes.func.isRequired,

src/components/Widgets/MarkdownControlElements/Toolbar/ToolbarComponentsMenu.js

@@ -6,7 +6,7 @@ import styles from './ToolbarComponentsMenu.css';
 
 export default class ToolbarComponentsMenu extends React.Component {
   static PropTypes = {
-    plugins: ImmutablePropTypes.list.isRequired,
+    plugins: ImmutablePropTypes.map.isRequired,
     onComponentMenuItemClick: PropTypes.func.isRequired,
   };