Try to fix javadoc errors on Travis CI with OpenJDK11
@@ -198,6 +198,7 @@ configure(subprojects.findAll { !it.isDistribution() }) {
javadoc {
// Oracle JDK8 likes to fail the build over spoiled HTML
options.addStringOption('Xdoclint:none', '-quiet')
+ options.source('8')
}
}
}
