Update readme with 3.1.1 release (#1099)

README.md

@@ -8,7 +8,7 @@ For a deep dive into the project, refer to the Spring Cloud AWS documentation:
 
 | Version                | Reference Docs                                                                                   | API Docs                                                                            |
 |------------------------|--------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------|
-| Spring Cloud AWS 3.1.0 | [Reference Docs](https://docs.awspring.io/spring-cloud-aws/docs/3.1.0/reference/html/index.html) | [API Docs](https://docs.awspring.io/spring-cloud-aws/docs/3.1.0/apidocs/index.html) | 
+| Spring Cloud AWS 3.1.1 | [Reference Docs](https://docs.awspring.io/spring-cloud-aws/docs/3.1.1/reference/html/index.html) | [API Docs](https://docs.awspring.io/spring-cloud-aws/docs/3.1.1/apidocs/index.html) | 
 | Spring Cloud AWS 3.0.4 | [Reference Docs](https://docs.awspring.io/spring-cloud-aws/docs/3.0.4/reference/html/index.html) | [API Docs](https://docs.awspring.io/spring-cloud-aws/docs/3.0.4/apidocs/index.html) | 
 | Spring Cloud AWS 2.4.4 | [Reference Docs](https://docs.awspring.io/spring-cloud-aws/docs/2.4.4/reference/html/index.html) | [API Docs](https://docs.awspring.io/spring-cloud-aws/docs/2.4.4/apidocs/index.html) | 
 | Spring Cloud AWS 2.3.5 | [Reference Docs](https://docs.awspring.io/spring-cloud-aws/docs/2.3.5/reference/html/index.html) | [API Docs](https://docs.awspring.io/spring-cloud-aws/docs/2.3.5/apidocs/index.html) |