README: update k8s requirement to 1.5.3+
[skip ci]
@@ -28,7 +28,7 @@ Read [Developer Guide](./doc/dev/developer_guide.md) for setting up development
## Requirements
-- Kubernetes 1.4+
+- Kubernetes 1.5.3+
- etcd 3.0+
## Demo
@@ -391,8 +391,6 @@ Check the other two pods and you should see the same result.
## Limitations
-- The etcd operator does not work well with Kubernetes 1.5.0, 1.5.1, and 1.5.2: https://github.com/kubernetes/kubernetes/issues/39816.
-
- The etcd operator only manages the etcd cluster created in the same namespace. Users need to create multiple operators in different namespaces to manage etcd clusters in different namespaces.
- Backup works only for data in etcd3 storage, not for data in etcd2 storage.
