watchful 0.3.0

What's Changed

• add brightness selector by @Sir-Thomas in #14
• Add DFU support by @lulf in #15
• Add support for validating new firmware by @lulf in #16
• Add support for vibration by @realroot2185 in #17
• fix: fix nrf DFU by updating to new version by @lulf in #18

New Contributors

• @Sir-Thomas made their first contribution in #14
• @realroot2185 made their first contribution in #17

Full Changelog: v0.2.6...v0.3.0