Artifact mismatch from documentation

[rrmcguinness]

The current readme has:

<dependency>
    <groupId>com.fireflysource</groupId>
    <artifactId>firefly</artifactId>
    <version>5.0.2</version>
</dependency>

however, the artifact is not available in Maven Central, only 5.0.0-dev6 is the latest available.