A kotlin implementation for the caluclation of Holidays.
The central entry point is the class KHol, which has to be constructed with HolidayDeclarations. These declarations are usually constructed based on Countries (eg. Germany or Belgium).
https://central.sonatype.org/publish/requirements/gpg/#signing-a-file
https://central.sonatype.com/artifact/org.javafreedom/khol pkg:maven/org.javafreedom/khol@1.0.1