Scala version 2.13

[barambani]

I've noticed that the project's scala version is still 2.12. I'm not sure if there's a reason for that. If it's not just an overlook I'm happy to close this PR.

[codecov-io]

Codecov Report

Merging #3320 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3320   +/-   ##
=======================================
  Coverage   93.31%   93.31%           
=======================================
  Files         378      378           
  Lines        7684     7684           
  Branches      233      206   -27     
=======================================
  Hits         7170     7170           
  Misses        514      514

Flag	Coverage Δ
#scala_version_212	93.38% <ø> (ø)	⬆️
#scala_version_213	93.09% <ø> (ø)	⬆️

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[travisbrown]

@barambani I think there are two reasons we haven't changed these defaults yet (or at least why I haven't—others might have other reasons):

• IIRC we'd have to roll back to 2.13.0 for the docs to build on 2.13. I can't remember the details, and it hasn't seemed important enough to spend time investigating.
• Presumably stuff is a little more likely to break on 2.12, so if I want to quickly make sure I haven't broken anything, having e.g. validateBC run for 2.12 by default seems reasonable.

I'd be happy to move to 2.13 as default if we can resolve the first issue without rolling back to 2.13.0, though.

[barambani]

Yes I realised from the ci that the issue might be this tpolecat/tut#263, and also the other you mention makes sense.
I'm closing this for a better time, as the ticket implies the solution is moving to mdoc.