Feature-rich third-party Bats library

[AlexSkrypnyk]

Re-posting my original issue for visibility.

I'm an author and maintainer of https://github.com/drevops/bats-helpers library. It is a feature-rich and constantly maintained library of BATS helpers and assertions. It has own tests with 90%+ coverage and documentation site (https://bats-helpers.drevops.com/). It is used on several OSS and non-OSS projects.

I'd like to have it added to the list of the libraries in the docs, so that the community could use it.

Describe the solution you'd like
Add the library reference to the https://github.com/bats-core/bats-core/blob/master/docs/source/writing-tests.md page