Release 0.4.0

Author: davidli2010

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "etcd-client"
-version = "0.3.1"
+version = "0.4.0"
 authors = ["The etcd-client Authors <davidli2010@foxmail.com>"]
 edition = "2018"
 readme = "README.md"

README.md

@@ -21,7 +21,7 @@ It provides asynchronous client backed by [tokio](https://github.com/tokio-rs/to
 - [x] Lock
 - [x] Auth
 - [x] Maintenance
-- [ ] Cluster
+- [x] Cluster
 - [ ] Election
 
 ## Usage