Bump postcss from 7.0.3 to 7.0.4
Bump postcss from 7.0.3 to 7.0.4

Bumps [postcss](https://github.com/postcss/postcss) from 7.0.3 to 7.0.4.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/7.0.3...7.0.4)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
jeffjewiss/postcss-stats-reporter