Update README.md

Ovilia · Ovilia · commit 4882c2c70079 · 2014-08-06T10:41:02.000+08:00
diff --git a/README.md b/README.md
@@ -75,7 +75,7 @@ http://zhangwenli.com/ThreeExample.js/Chapter7/7.2.1.html
 
 http://zhangwenli.com/ThreeExample.js/Chapter7/7.3.1.html
 
-http://zhangwenli.com/ThreeExample.js/Chapter6/7.3.2.html
+http://zhangwenli.com/ThreeExample.js/Chapter7/7.3.2.html
 
 Chapter 8
 ---------
