crawler4j-boms de.hs-heilbronn.mi 4.8.2 4.0.0 pom crawler4j-with-urlfrontier ${project.groupId}:${project.artifactId} de.hs-heilbronn.mi crawler4j-core ${crawler4j.version} de.hs-heilbronn.mi crawler4j-frontier-urlfrontier ${crawler4j.version}