Make CI test both versions of scala on PR

[codefromthecrypt]

Right now, we only deploy both versions of scala. It would be nice to run tests on both versions, even if there's little chance we will break.

[jcchavezs]

I could give it a try if none else. I got some expertise on ci matrix :p ons. 2. sep. 2020, 13:34 skrev Adrian Cole <notifications@github.com>:

…

Right now, we only deploy both versions of scala. It would be nice to run tests on both versions, even if there's little chance we will break. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#90>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAXOYASP5T2FBH327EDCBUDSDYUTXANCNFSM4QS4YG7A> .

[codefromthecrypt]

hah cool! the trick will be that since the build has _2.12 in it you will need to hack slightly to replace that with _2.13 to run tests only on the matrix for scala 2.13. Matrix for scala 2.12 is default basically. Be sure to not have this affect things that actually deploy (eg do this only in PR not master or release-N.N.N or N.N.N tag)