Prepare v3.1.0 release

Author: ricardozanini

README.md

@@ -48,7 +48,7 @@ This table indicates the current state of implementation of various SDK features
 | [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)       |
 | [v2.1.2](https://github.com/serverlessworkflow/sdk-go/releases/tag/v2.1.2) |      [v0.7](https://github.com/serverlessworkflow/specification/tree/0.7.x)       |
 | [v2.5.0](https://github.com/serverlessworkflow/sdk-go/releases/tag/v2.5.0) |      [v0.8](https://github.com/serverlessworkflow/specification/tree/0.8.x)       |
-| [v3.0.0](https://github.com/serverlessworkflow/sdk-go/releases/tag/v3.0.0) | [v1.0.0](https://github.com/serverlessworkflow/specification/releases/tag/v1.0.0) |
+| [v3.1.0](https://github.com/serverlessworkflow/sdk-go/releases/tag/v3.1.0) | [v1.0.0](https://github.com/serverlessworkflow/specification/releases/tag/v1.0.0) |
 
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