Playerdata is now automatically migrated when switching to premiumAutologin (#23). Feature should be now more or less stable. Please report any bugs regarding it :).
(Advancements are not (yet) migrated.)
Developer information
Projects on Modrinth are automatically available through a Maven repository for use with JVM build tools such as Gradle.
maven { name = "Modrinth"; url = "https://api.modrinth.com/maven" }