chore(deps-dev): bump @rollup/plugin-babel from 5.0.3 to 5.0.4

Bumps [@rollup/plugin-babel](https://github.com/rollup/plugins) from 5.0.3 to 5.0.4.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Commits](rollup/plugins@babel-v5.0.3...babel-v5.0.4)

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