Avoid duplicated version in README.md

Co-authored-by: Yuta Saito <[email protected]>

Author: AntonioCandinho

README.md

@@ -15,7 +15,6 @@ docker pull ghcr.io/swiftwasm/swift:latest
 - [5.8, 5.8-jammy, jammy, latest](https://github.com/swiftwasm/swiftwasm-docker/blob/main/5.8/ubuntu/22.04/Dockerfile)
 - [5.8-focal, focal](https://github.com/swiftwasm/swiftwasm-docker/blob/main/5.8/ubuntu/20.04/Dockerfile)
 - [5.8-bionic, bionic](https://github.com/swiftwasm/swiftwasm-docker/blob/main/5.8/ubuntu/18.04/Dockerfile)
-- [5.8, 5.8-bionic](https://github.com/swiftwasm/swiftwasm-docker/blob/main/5.8/ubuntu/18.04/Dockerfile)
 - [5.7, 5.7-jammy](https://github.com/swiftwasm/swiftwasm-docker/blob/main/5.7/ubuntu/22.04/Dockerfile)
 - [5.7-bionic](https://github.com/swiftwasm/swiftwasm-docker/blob/main/5.7/ubuntu/18.04/Dockerfile)
 - [5.7-focal](https://github.com/swiftwasm/swiftwasm-docker/blob/main/5.7/ubuntu/20.04/Dockerfile)