Update README.md

Author: kevin369ml

README.md

@@ -9,7 +9,7 @@
 1. My youtube: https://www.youtube.com/c/KevinXu
 2. My Chinese weibo (微博): http://weibo.com/3983872447/profile
 3. My Chinese youku (优酷): http://i.youku.com/deeplearning101
-4. My QQ group (深度学习QQ群): 153032765,  2群：462661267
+4. My QQ group (深度学习QQ群): 153032765 (人满),  请加2群：462661267
 
 
 # Have fun!