3.9.0

What's Changed

• Issue #190: optimisation by @RobinTail in #200
• Upgrading checkout action to v4 by @RobinTail in #206
• Feat: specify the printer relay by @RobinTail in #203
• Disconnecting from the printer before when turning its relay off by @RobinTail in #207
• 🚀 3.9.0 by @RobinTail in #201

Full Changelog: 3.8.2...3.9.0