Bump micro-dev from 2.2.0 to 3.0.0

Bumps [micro-dev](https://github.com/zeit/micro-dev) from 2.2.0 to 3.0.0.
- [Release notes](https://github.com/zeit/micro-dev/releases)
- [Commits](vercel/micro-dev@2.2.0...3.0.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support