Prepare Release v2.2.0 (#132)

Signed-off-by: Ricardo Zanini <zanini@redhat.com>

Signed-off-by: Ricardo Zanini <zanini@redhat.com>

Author: ricardozanini

README.md

@@ -18,7 +18,8 @@ Current status of features implemented in the SDK is listed in the table below:
 | :---: | :---: |
 | [v1.0.0](https://github.com/serverlessworkflow/sdk-go/releases/tag/v1.0.0) | [v0.5](https://github.com/serverlessworkflow/specification/tree/0.5.x) |
 | [v2.0.1](https://github.com/serverlessworkflow/sdk-go/releases/tag/v2.0.1) | [v0.6](https://github.com/serverlessworkflow/specification/tree/0.6.x) |
-| [v2.1.x](https://github.com/serverlessworkflow/sdk-go/releases/tag/v2.1.0) | [v0.7](https://github.com/serverlessworkflow/specification/tree/0.7.x) |
+| [v2.1.2](https://github.com/serverlessworkflow/sdk-go/releases/tag/v2.1.2) | [v0.7](https://github.com/serverlessworkflow/specification/tree/0.7.x) |
+| [v2.2.0](https://github.com/serverlessworkflow/sdk-go/releases/tag/v2.2.0) | [v0.8](https://github.com/serverlessworkflow/specification/tree/0.8.x) |
 
 ## How to use
 
@@ -64,4 +65,4 @@ The `Workflow` structure then can be used in your application.
 
 ## Slack Channel
 
-Join us at [CNCF Slack](https://communityinviter.com/apps/cloud-native/cncf), channel `#serverless-workflow-sdk` and say hello 🙋.
+Join us at [CNCF Slack](https://communityinviter.com/apps/cloud-native/cncf), channel `#serverless-workflow-sdk` and say hello 🙋.