Tagging new 3.0.1 release

Tagging 3.0.0 final version

Updating version to 3.0.0-rc1 for release

Updating pom.xml following Sonatype's tutorial

[maven-release-plugin] copy for tag lanterna-3.0.0-beta2

[maven-release-plugin] copy for tag lanterna-3.0.0-beta1

[maven-release-plugin] copy for tag lanterna-3.0.0-alpha6

[maven-release-plugin] copy for tag lanterna-3.0.0-alpha5

[maven-release-plugin] copy for tag lanterna-3.0.0-alpha4

[maven-release-plugin] copy for tag lanterna-2.1.9