Bump scratch-paint

Bumps [scratch-paint](https://github.com/LLK/scratch-paint) from 0.2.0-prerelease.20200515190220 to 0.2.0-prerelease.20200516002830.
- [Release notes](https://github.com/LLK/scratch-paint/releases)
- [Commits](https://github.com/LLK/scratch-paint/commits

)

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