JCenter end of life

[nbonbon]

JFrog announced that they'll be shutting down JCenter:
https://jfrog.com/blog/into-the-sunset-bintray-jcenter-gocenter-and-chartcenter/

Key dates:

• March 31st 2021: No more submissions will be accepted to Bintray, JCenter
• February 1st 2022: Bintray, JCenter services will no longer be available

Hence kotlin-argparser should also be migrated to another maven repository like Maven central.