Merge pull request #369 from sunnylovestiramisu/readme

Update Feature Status in README

Author: k8s-ci-robot

README.md

@@ -24,8 +24,8 @@ The following table reflects the head of this branch.
 
 | Feature                | Status  | Default | Description                                                                                                                   |
 | ---------------------- | ------- | ------- | ----------------------------------------------------------------------------------------------------------------------------- |
-| VolumeExpansion        | Beta    | On      | [Support for expanding CSI volumes](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#csi-volume-expansion).    |
-| ReadWriteOncePod       | Alpha   | Off     | [Single pod access mode for PersistentVolumes](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#access-modes). |
+| VolumeExpansion        | Stable  | On      | [Support for expanding CSI volumes](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#csi-volume-expansion).    |
+| ReadWriteOncePod       | Stable  | On      | [Single pod access mode for PersistentVolumes](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#access-modes). |
 | VolumeAttributesClass  | Alpha   | Off     | [Volume Attributes Classes](https://kubernetes.io/docs/concepts/storage/volume-attributes-classes).                           |
 
 ## Usage