Update README.md

3D/beepberry-cases/slim_flat/README.md

 # Simple slim, flat, minimal Case for the Beepberry
-![01](images/01.jpg | width=200) ![02](images/02.jpg | width=200)  
-![03](images/03.jpg | width=200) ![04](images/04.jpg | width=200)  
+<img src=images/01.jpg width=200> <img src=images/02.jpg | width=200)  
+<img src=images/03.jpg width=200> <img src=images/04.jpg | width=200)  
   
 **Parts List**
 * Two printed parts
@@ -17,10 +17,10 @@
 * That's it!
   
 This end first:  
-![05](images/05.jpg | width=200)  
+<img src=images/05.jpg | width=200>  
   
 Cut the foam around the big chips so airflow isn't blocked for them:  
-![06](images/06.jpg | width=200)  
+<img src=images/06.jpg | width=200>  
   
 Battery on top:  
-![07](images/07.jpg | width=200)  
+<img src=images/07.jpg | width=200>