Merge pull request #1473 from CecileRobertMichon/readme-v1alpha4

Update README for version support and add v1alpha4

Author: k8s-ci-robot

README.md

@@ -29,20 +29,24 @@ See the [flavors documentation][flavors_doc] to know which cluster templates are
 
 This provider's versions are compatible with the following versions of Cluster API:
 
-|  | Cluster API `v1alpha2` (`v0.2.x`) | Cluster API `v1alpha3` (`v0.3.x`) |
-|---|---|---|
-|Azure Provider `v0.3.x` | ✓ |  |
-|Azure Provider `v0.4.x` |  | ✓ |
+|  | Cluster API `v1alpha2` (`v0.2.x`) | Cluster API `v1alpha3` (`v0.3.x`) | Cluster API `v1alpha4` (`v0.4.x`) |
+|---|---|---|---|
+|Azure Provider `v0.3.x` | ✓ |  |  |
+|Azure Provider `v0.4.x` |  | ✓ |  |
+|Azure Provider `v0.5.x` |  |  | ✓ |
 
 This provider's versions are able to install and manage the following versions of Kubernetes:
 
-|  | Azure Provider `v0.3.x` | Azure Provider `v0.4.x` |
-|---|---|---|
-| Kubernetes 1.15 | ✓ |  |
-| Kubernetes 1.16 | ✓ | ✓ |
-| Kubernetes 1.17 |  | ✓ |
-| Kubernetes 1.18 |  | ✓ |
-| Kubernetes 1.19 |  | ✓ |
+|  | Azure Provider `v0.3.x` | Azure Provider `v0.4.x` | Azure Provider `v0.5.x` |
+|---|---|---|---|
+| Kubernetes 1.15 | ✓ |  |  |
+| Kubernetes 1.16 | ✓ | ✓ |  |
+| Kubernetes 1.17 |  | ✓ |  |
+| Kubernetes 1.18 |  | ✓ | ✓ |
+| Kubernetes 1.19 |  | ✓ | ✓ |
+| Kubernetes 1.20 |  | ✓ | ✓ |
+| Kubernetes 1.21 |  | ✓ | ✓ |
+| Kubernetes 1.22 |  |   | ✓ |
 
 Each version of Cluster API for Azure will attempt to support at least two Kubernetes versions e.g., Cluster API for Azure `v0.1` may support Kubernetes 1.13 and Kubernetes 1.14.