suppress scalacheck output when running only scalatest tests

[fommil]

this may be an sbt problem, but when I run something like

core/it:test-only *SearchServiceSpec -- -z "refresh files that have changed"

(which only matches scalatest tests) then I get this in the output

[info] ScalaCheck
[info] Passed: Total 0, Failed 0, Errors 0, Passed 0
[info] Warning: Unknown ScalaCheck args provided: -z refresh files that have changed

I'd like to suppress scalacheck output here please.

Full sources for reproduction at https://github.com/fommil/ensime-server/commits/graphpocalypse

[fommil]

nice 😄 when will this be in a release?