docs: Update version in README

Author: fabapp2

README.adoc

@@ -3,7 +3,7 @@
 
 image:https://img.shields.io/github/license/spring-projects-experimental/spring-boot-migrator[GitHub]
 image:https://img.shields.io/github/v/release/spring-projects-experimental/spring-boot-migrator[GitHub release (latest by date)]
-image:https://img.shields.io/github/downloads/spring-projects-experimental/spring-boot-migrator/0.12.0/total[GitHub release (latest by date)]
+image:https://img.shields.io/github/downloads/spring-projects-experimental/spring-boot-migrator/0.13.0/total[GitHub release (latest by date)]
 
 image:https://img.shields.io/badge/Join-Slack-green?logo=slack&color=007EC6&style=for-the-badge[link="https://join.slack.com/t/springbootmigrator/shared_invite/zt-1k6yxfi3b-MEQ_MM67qXufWtc~Tw6y9w"]
 image:https://img.shields.io/github/discussions/spring-projects-experimental/spring-boot-migrator?label=GitHub%20discussions&logo=GitHUb&style=for-the-badge[GitHub Discussions]