Bumps [acorn](https://github.com/acornjs/acorn) from 6.3.0 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/6.3.0...6.4.1

)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

As this is the file codecov reads.

post.* has been added directly under assets for now, tried it
via webpack but this added a several times overhead to these
very small files, so this seemed the cleanest solution for now.
But might be improved upon.