Fix the last eslint error

Author: julienw

src/ContextMenu.js

@@ -153,6 +153,8 @@ export default class ContextMenu extends AbstractMenu {
         this.handleHide(e);
     };
 
+    // Disabling this rule for more consistency.
+    /* eslint-disable-next-line class-methods-use-this */
     hideMenu = (e) => {
         if (e.keyCode === 27 || e.keyCode === 13) { // ECS or enter
             hideMenu();