doc: add compatibility test link to README.md
diff --git a/README.md b/README.md
index cffaa7b..098429d 100644
--- a/README.md
+++ b/README.md
@@ -179,6 +179,7 @@
* [dubbo-samples-annotation](dubbo-samples-annotation/case-configuration.yml) : A simple provider service with builtin zookeeper.
* [dubbo-samples-api](dubbo-samples-api/case-configuration.yml) : A simple provider service with external zookeeper.
* [dubbo-samples-chain](dubbo-samples-chain/case-configuration.yml) : A multiple services with external zookeeper.
+ * [dubbo-samples-migration](dubbo-samples-migration/case-configuration.yml) : A compatibility test with the provider and consumer have different dubbo verison.
That's it, then feel free to add more integration test for the Dubbo project, have fun.
