Which Scala versions are supported

[kenji yoshida]

There are scala 2.10 and 2.11 in the app module crossScalaVersions.

scalaxb/build.sbt

Line 57 in 85271cc

 crossScalaVersions := Seq(scala3, scala213, scala212, scala211, scala210) 

But maybe does not check in github actions CI.

scalaxb/build.sbt

Line 77 in 85271cc

 crossScalaVersions := Seq(scala212, scala213) 

scalaxb/.github/workflows/ci.yml

Lines 35 to 37 in 85271cc

             sbt -v ++2.12.x "scalaxbPlugin/scripted" 
             sbt -v ++3.x "app/Test/compile" 
             sbt -v +integration/test 

• Should we fix ci settings?(restore scala 2.10 and 2.11 test)
• remove old scala and sbt 0.13 version settings in build files

WDYT? 👀 🤔

[eugene yokota]

Assuming most users care about sbt 1.x plugin support, I guess we can drop Scala 2.10 and 2.11, and maybe test if the generated code works in various Scala versions in the scripted test or something.