Append the SDK item in 0.4.0 release (master branch)
diff --git a/download.md b/download.md
index 4b66dfa..e539031 100644
--- a/download.md
+++ b/download.md
@@ -41,6 +41,8 @@
* [mini-submarine](https://hub.docker.com/layers/apache/submarine/mini-0.4.0/images/sha256-3dd49054bf8a91521f5743c675278d626a5fa568e91651c67867b8ba6ceba340) `docker pull apache/submarine:mini-0.4.0`
* [submarine server](https://hub.docker.com/layers/apache/submarine/server-0.4.0/images/sha256-9e9775e0ed2ac9d4b108dd747dfb4f4fc27cee0fdd19501e1f53db30d966a3db) `docker pull apache/submarine:server-0.4.0`
* [submarine database](https://hub.docker.com/layers/apache/submarine/database-0.4.0/images/sha256-5edf4aac2c14e14f78a9955bd84757879e1c05266c1edd5a7d5ef08b6359a400) `docker pull apache/submarine:database-0.4.0`
+ * SDK:
+ * [PySubmarine](https://pypi.org/project/apache-submarine/0.4.0/) `pip install apache-submarine==0.4.0`
## Verify the integrity of the files
