Scoverage can't compile modules with moduleDeps

[nrktkt]

mill amodule.scoverage.compile will not work for any amodule that has defined moduleDeps. I suspect the scoverage module needs to def moduleDeps = outer.moduleDeps.

build file to reproduce:
(also need to create a class in foo and import it in the other project)

// build.sc

import $ivy.`com.lihaoyi::mill-contrib-buildinfo:0.4.0`
import mill.contrib.scoverage.ScoverageModule

object foo extends ScalaModule {
  def scalaVersion = "2.12.7"
}

object scoverageSadness extends ScalaModule with ScoverageModule {
  def scoverageVersion = "1.3.1"
  def scalaVersion = "2.12.7"

  def moduleDeps = Seq(foo)

  object test extends ScoverageTests {
    def ivyDeps = Agg(ivy"org.scalatest::scalatest:3.0.5")
    def testFrameworks = Seq("org.scalatest.tools.Framework")
  }
}

run scoverageSadness.compile to confirm it works, then run scoverageSadness.scoverage.compile to confirm not found errors on imports.

Does that diagnosis sound right @nvander1?

PS: thanks for the scoverage PR, very handy.