Update README.md

Author: sendya

README.md

@@ -1,5 +1,7 @@
 # Kratos Contrib
 
+[![Go](https://github.com/omalloc/contrib/actions/workflows/go.yml/badge.svg)](https://github.com/omalloc/contrib/actions/workflows/go.yml)
+
 ## Components
 
 - zap (uber-go/zap)
@@ -11,3 +13,7 @@
 - gin (kratos gin-middleware [issue#6](https://github.com/go-kratos/gin/issues/6))
 - caching
   - loadable-cache (auto refresh kv data)
+
+## Helper
+
+- singlelight via generics support.