Use defaut Maven character encoding by default

The abstract class `org.liquibase.maven.plugins.AbstractLiquibaseMojo` has the following instance variable:
`protected String outputFileEncoding;`.

Would it be possible to annotate this variable to use the standard character encoding of Maven by default instead of setting this property manually (see bellow) ?

`@Parameter(property="liquibase.outputFileEncoding", defaultValue="${project.build.sourceEncoding}")    
protected String outputFileEncoding;`