Fix mima for ScalaCheckRunner.deserializeTask

method org.scalacheck.ScalaCheckRunner.deserializeTask(String,Function1)#BaseTask
  in class org.scalacheck.ScalaCheckRunner has a different result type
  in current version, where it is sbt.testing.Task rather than
  org.scalacheck.ScalaCheckRunner#BaseTask

Author: ashawley

src/main/scala/org/scalacheck/ScalaCheckFramework.scala

@@ -27,7 +27,7 @@ private abstract class ScalaCheckRunner extends Runner {
   val errorCount = new AtomicInteger(0)
   val testCount = new AtomicInteger(0)
 
-  def deserializeTask(task: String, deserializer: String => TaskDef) = {
+  def deserializeTask(task: String, deserializer: String => TaskDef): BaseTask = {
     val taskDef = deserializer(task)
     val countTestSelectors = taskDef.selectors.toSeq.count {
       case _:TestSelector => true