ReleaseSpec(label: String, minJosmVersion: Int, description: String? = null, name: String? = null)
A release specification maintained in the local releases.yml file
label - the release label, e.g. 1.2.3
minJosmVersion - the lowest JOSM version this release is compatible with
description - a description for the plugin release (optional)
name - a name for the release. If omitted, null or blank, it's set to "Release label".