update README.md

Author: zendive

README.md

@@ -84,6 +84,13 @@ with a single argument, that will shift objects from right to left, showing diff
   - listens on `jsdiff-devtools-to-panel-compare` requests
   - listens on `jsdiff-devtools-to-panel-search` and tries to find query in DOM
 
-### Screenshot
+<details>
+  <summary>Screenshots</summary>
 
-![screenshot](./src/img/screenshot-01.png)
+- Comparing two objects
+  ![screenshot](./src/img/screenshot-01.png)
+
+- Tracking changes in localStorage (unchanged are hidden)
+  ![screenshot](./src/img/screenshot-02.png)
+
+</details>