Update README

Signed-off-by: Beat Buesser <[email protected]>

Author: Beat Buesser

README-cn.md

@@ -1,6 +1,6 @@
 # Adversarial Robustness Toolbox (ART) v1.3
 <p align="center">
-  <img src="docs/images/art_lfai.png?raw=true" width="250" title="ART logo">
+  <img src="docs/images/art_lfai.png?raw=true" width="467" title="ART logo">
 </p>
 <br />