Law testing documentation improvement

[miklos-martin]

Hi,

First of all, thank you all for your amazing work on cats.

I have recently upgraded to 2.0 and I had a semi-hard time figuring out how to make my tests compile again. Previously I have been using CatsSuite from cats-testkit. If I understand correctly, my tests broke because of 9ef3af0.

I had some trouble following the Laws Testing docs and I think it would be nice to mention there what additional dependencies one will need if they are using scalatest, or specs2 (I'm using scalatest and I needed to add a snapshot version of it to have org.scalatest.funsuite.AnyFunSuite and a milestone release ofdiscipline-scalatest in addition to cats-laws to have org.typelevel.discipline.scalatest.Discipline).

I could send a PR if you like, what do you think?

[kailuowang]

Sorry about the inconveniences, it's an oversight on our part, I did update the doc to point to the new way to use Catsuite, but we didn't publish the website, which I will do shortly. In the meantime, I think it's a good idea to mention dependency needed if you are not using Catsuite: a milestone release of discipline-scalatest in addition to cats-laws. A PR will be great!

[miklos-martin]

Fixed in #3072, thanks!