Update readme that this repository is no longer maintained

[xmik]

Hi. In light of the latest events, I find it helpful if there was a note in Bats readme about BATS-core. I just would like to inform people who want to make Bats better and create new issues or PRs here, e.g.

• https://github.com/sstephenson/bats/issues/245
• https://github.com/sstephenson/bats/pull/247
• https://github.com/sstephenson/bats/pull/200

about BATS-core and I think writing that in each issue/PR not effective.

You may merge this PR or treat it as a draft only but I think some information in readme or in git repo description is needed.

I also spotted this information:

If or when this repo is active again, it can optionally be integrated through git.

in the announcement issue. You may want to attach it too.

And thank you @sstephenson for Bats, very much! I use it frequently and in many projects and while I haven't tried BATS-core yet, I like it that this test framework will be maintained again and improved.

[odoublewen]

@sstephenson It would be useful to have this info in the README. Please consider merging. Thanks @xmik

[nylen]

@sstephenson @rodoabad: can you merge this please?

[qneill]

Hi @sstephenson and @rodoabad any thoughts on merging this commit?

[nylen]

Ah, I guess only @sstephenson can do it - the other reviewers here do not have write access.

[Vampire]

I almost started trying bats, also because of this blog post: https://opensource.com/article/19/2/testing-bash-bats Please merge this PR

[Gowiem]

@sstephenson Please merge this. This version of bats is linked a bunch of places online and people (myself included) run into this issue of using this outdated, unmaintained version all the time it seems.

[alvations]

This PR is so much needed, esp. with #150