Update README

Author: rbygrave

README.md

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+[![Build](https://github.com/avaje/avaje-applog/actions/workflows/build.yml/badge.svg)](https://github.com/avaje/avaje-applog/actions/workflows/build.yml)
+[![Maven Central](https://img.shields.io/maven-central/v/io.avaje/avaje-applog.svg?label=Maven%20Central)](https://mvnrepository.com/artifact/io.avaje/avaje-applog)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/avaje/avaje-applog/blob/master/LICENSE)
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 # avaje-applog
 
 Application and library use of Java `System.Logger` logging facade.