Bugfix/download link (#405)

* Fix download link
diff --git a/docs/download/download.md b/docs/download/download.md
index c47e82d..09b5801 100644
--- a/docs/download/download.md
+++ b/docs/download/download.md
@@ -24,7 +24,7 @@
 # Archived Release

 ## 0.20.0 

 * Released in Nov 30, 2018

-* [source]https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz) | [asc](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz.asc) | [sha](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz.sha512)

+* [source](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz) | [asc](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz.asc) | [sha](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz.sha512)

 

 ## 0.19.0

 * Released in Oct 30, 2018

diff --git a/docs/zh/download/download.md b/docs/zh/download/download.md
index acdfc3f..0f1e5e4 100644
--- a/docs/zh/download/download.md
+++ b/docs/zh/download/download.md
@@ -24,7 +24,7 @@
 # 历史版本
 ## 0.20.0 
 * 发布日期 2018年11月30日
-* [源代码]https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz) | [签名](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz.asc) | [哈希](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz.sha512)
+* [源代码](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz) | [签名](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz.asc) | [哈希](https://archive.apache.org/dist/incubator/weex/0.20.0/apache-weex-incubating-0.20.0-src.tar.gz.sha512)
 
 ## 0.19.0
 * 发布日期 2018年10月30日