Fix (zh-cn)download.md 2.7.2 Link failure (#528)

Fix (zh-cn)download.md 2.7.2 Link failure
diff --git a/blog/zh-cn/download.md b/blog/zh-cn/download.md
index f743af0..d08127d 100644
--- a/blog/zh-cn/download.md
+++ b/blog/zh-cn/download.md
@@ -37,9 +37,9 @@
 
 ### 2.7.2 (2019-06-06)
 
-* [source](https://www.apache.org/dyn/closer.cgi?path=dubbo/2.7.2/apache-dubbo-2.7.2-src.zip) |
-[asc](https://www.apache.org/dist/dubbo/2.7.2/apache-dubbo-2.7.2-src.zip.asc) |
-[sha512](https://www.apache.org/dist/dubbo/2.7.2/apache-dubbo-2.7.2-src.zip.sha512)
+* [source](https://archive.apache.org/dist/dubbo/2.7.2/apache-dubbo-2.7.2-src.zip) |
+[asc](https://archive.apache.org/dist/dubbo/2.7.2/apache-dubbo-2.7.2-src.zip.asc) |
+[sha512](https://archive.apache.org/dist/dubbo/2.7.2/apache-dubbo-2.7.2-src.zip.sha512)
 
 ### 2.7.1 (2019-03-26)