v0.13.0

With the addition of a new Sonatype-related spec, sonatypeSpec is now deprecated:

• use nexusSpec if you use Nexus repositories and/or you have a OSSRH project that syncs to Maven Central
• use centralPortalSpec if you are using Sonatype's new entry point for Maven Central, as described here

What's Changed

• Central Portal support by @natario1 in #19

Full Changelog: v0.12.0...v0.13.0