Fix small README issue

christianversloot · christianversloot · commit acd30f533c5d · 2020-12-01T19:42:39.000+01:00
diff --git a/README.md b/README.md
@@ -220,7 +220,7 @@ from extra_keras_datasets import usps
 
 <a href="./assets/usps.png"><img src="./assets/usps.png" width="100%" style="border: 3px solid #f6f8fa;" /></a>
 
-===
+---
 
 ## Contributors and other references
 * **EMNIST dataset:**
