Broken documentation link

[breun]

On https://spring.io/projects/spring-credhub#learn version 3.0.0 is marked as current and links to https://docs.spring.io/spring-credhub/docs/current/reference, which actually displays the documentation for version 3.1.1. So, I guess 3.0.0 is not current.

According to https://central.sonatype.com/artifact/org.springframework.credhub/spring-credhub/versions version 3.1.0 is the latest version on Maven Central.