Readme has changed artifact name

Hi,

Just a note when reinstalling this, the mvn command in README should likely be as in the CICD pipeline:

mvn install:install-file -Dfile=cicd/cesiumlanguagewriter-3.0.0.jar -DgroupId=com.agi -DartifactId=cesiumlanguagewriter -Dversion=3.0.0 -Dpackaging=jar -DgeneratePom=true