Fantom-foundation/go-lachesis

Please check if what you want to add to `go-lachesis` list meets [quality standards](https://github.com/Fantom-foundation/go-lachesis/blob/master/CONTRIBUTING.md#quality-standard) before sending pull request.

**Please provide package links to:**

- github.com repo:
- godoc.org:
- goreportcard.com:
- coverage service link ([cover.run](https://cover.run/), [gocover](http://gocover.io/), [coveralls](https://coveralls.io/) etc.), example: `[![cover.run](https://cover.run/go/github.com/user/repository.svg?style=flat&tag=golang-1.10)](https://cover.run/go?tag=golang-1.10&repo=github.com%2Fuser%2Frepository)`

**Make sure that you've checked the boxes below before you submit PR:**
- [ ] I have added my package in alphabetical order.
- [ ] I have an appropriate description with correct grammar.
- [ ] I know that this package was not listed before.
- [ ] I have added godoc link to the repo and to my pull request.
- [ ] I have added coverage service link to the repo and to my pull request.
- [ ] I have added goreportcard link to the repo and to my pull request.
- [ ] I have read [Contribution guidelines](https://github.com/Fantom-foundation/go-lachesis/blob/master/CONTRIBUTING.md#contribution-guidelines), [maintainers note](https://github.com/Fantom-foundation/go-lachesis/blob/master/CONTRIBUTING.md#maintainers) and [Quality standard](https://github.com/Fantom-foundation/go-lachesis/blob/master/CONTRIBUTING.md#quality-standard).