4.2.1

Fixes release asset matching that could silently hide available updates.

• Short-version DMGs such as MyApp-2.1.dmg now match tags such as v2.1, using the same tolerant version parser.
• Prerelease identifiers retain their case: matching RC.1 tags and assets are accepted, while RC.1 and rc.1 remain distinct. Repository names still match case-insensitively.

Changes: #28 and #29

Full Changelog: 4.2.0...4.2.1