Make old versions from jcenter are available on MavenCentral

[zaleslaw]

Due to jcenter closing from, old version like 5.0.1 will be not available in the nearest future. We are using klaxon in KotlinDL project.

After migration to 5.4, we've got a few issues, and it costs us a lot to support them in the following release. Could you please put a few previous versions, including 5.0.1, on MavenCentral? It will be very helpful and give us the ability to plan a migration to the newer versions.

[csMACnz]

I just hit the same issue for version 5.0.9 trying to move from jcenter to mavencentral and the version being missing.