Merge pull request #49 from metal-stack/upd-readme-v0.4

update readme

README.md

@@ -3,14 +3,16 @@
 Infrastructure provider for Kubernetes [Cluster API](https://cluster-api.sigs.k8s.io/) project, that allows you to deploy and manage Kubernetes cluster on [metal-stack](https://metal-stack.io/).
 
 ## Compatibility with Cluster API versions
-|                                      | Cluster API v1alpha3 (v0.3) |
-| ------------------------------------ | --------------------------- |
-| metal-stack Provider v1alpha3 (v0.1) | ✓                           |
+|                                        | Cluster API v1alpha3 (v0.3.x) | Cluster API v1alpha4 (v0.4.x) |
+| -------------------------------------- | ----------------------------- | ----------------------------- |
+| metal-stack Provider v1alpha3 (v0.3.x) | ✓                             |
+| metal-stack Provider v1alpha4 (v0.4.x) |                               | ✓
 
 ## Compatibility with Kubernetes versions
-|                                      | Kubernetes 1.21             |
-| ------------------------------------ | --------------------------- |
-| metal-stack Provider v1alpha3 (v0.1) | ✓                           |
+|                                        | Kubernetes 1.21             |
+| -------------------------------------- | --------------------------- |
+| metal-stack Provider v1alpha3 (v0.3.x) | ✓                           |
+| metal-stack Provider v1alpha4 (v0.4.x) | ✓                           |
 
 ## Docs
 You can check docs [here](docs/contents.md) -- there we have high-level description of architecture, resources and controllers. And also guide for testing and developing this provider locally.