net/ziina: update to 0.3.1 and rename to net/zmate

Upstream rebranded the project.

Changelog: https://github.com/ziinaio/ziina/releases/tag/v0.2.0
Changelog: https://github.com/ziinaio/ziina/releases/tag/v0.2.1
Changelog: https://github.com/ziinaio/ziina/releases/tag/v0.2.2
Changelog: https://github.com/ziinaio/zmate/releases/tag/v0.3.0
Changelog: https://github.com/ziinaio/zmate/releases/tag/v0.3.1