regression: 2.13 failing bootstrap (scala-xml + scala version number issue)

[SethTisue]

at https://scala-ci.typesafe.com/job/scala-2.13.x-integrate-bootstrap/136/artifact/logs/builds/*view*/ we see:

sbt.ResolveException: unresolved dependency: org.scala-lang.modules#scala-xml_2.13.0-pre-6af9749;1.0.6: not found

attn @lrytz

[lrytz]

fixed by scala/scala#5768