add support scala 2.12.18 2.12.19

[kmate-ct]

Same as https://github.com/tek/splain/pull/96 but for Scala 2.12.18 & 2.12.19.

[ppodlovics]

Yep, this would be great

[kmate-ct]

I can confirm that this works for 2.12.18.

[tribbloid]

thanks a lot! @tek would you like to bump the version number?

[tek]

it's been quite a while since I've had a working scala setup on my machine, so you're probably better of figuring it out yourself 🙂

[tribbloid]

Will tried to publish shortly. THB my SBT has been a bit rusty (switched to gradle)

@kmate-ct would you like to co-maintain? We can also appreciate an example for usage in bazel

if so, you'll only need the github collaborator privilege & sonatype artifactory write access