langmeta tests210 is not 2.10 specific

[olafurpg]

those tests should run on all scala versions. Regressed #1173

[xeno-by]

We run them on other Scala versions in the reorganized build, as part of the tests project.

[olafurpg]

Currently, publishLocal fails because tests210 is scalaVersion := "2.10" and depends on langmeta_2.12/2.11 The conventional way is to use crossScalaVersions := List(2.11/2.12/2.10). We can move to this setup when langmeta becomes a standalone repo.

[olafurpg]

IntelliJ import no longer works because tests210/update causes a resolution error

[info] Packaging /Users/ollie/dev/scalameta/scalameta/semanticdb-scalac-plugin/target/scala-2.12/semanticdb-scalac_2.12.4-2.1.3-31-75e5df82.jar ...
[info] Done packaging.
[trace] Stack trace suppressed: run 'last tests210/*:ssExtractDependencies' for the full output.
[trace] Stack trace suppressed: run 'last tests210/*:coursierResolutions' for the full output.
[error] (tests210/*:ssExtractDependencies) coursier.ResolutionException: Encountered 1 error(s) in dependency resolution: