run format script

src/dom_components/model/ToolbarButton.js

@@ -1,8 +1,10 @@
 import Backbone from 'backbone';
 
 export default class ToolbarButton extends Backbone.Model {
-  defaults = {
+  defaults() {
-    command: '',
+    return {
-    attributes: {},
+      command: '',
-  };
+      attributes: {},
+    };
+  }
 }