Update README.md

README.md

    <td> teaching math on <b>WBO</b>
    <td> <img alt="wbo teaching" width="300" src="https://user-images.githubusercontent.com/552629/59915737-a386e580-941d-11e9-81ff-db9e37f140db.png" />
    <td> drawing art
-   <td> <img alt="angel drawn on WBO" width="300" src="https://user-images.githubusercontent.com/552629/59914139-08404100-941a-11e9-9c29-bd2569fe4730.png"/>
+   <td> <img alt="kawai cats on WBO" width="300" src="https://user-images.githubusercontent.com/552629/120919822-dc2c3200-c6bb-11eb-94cd-57a4254fbe0a.png"/>
 </table>
 
 ## Running your own instance of WBO