be compatible with Settings change in Scala 2.12.10 (#384)

be compatible with Settings change in Scala 2.12.10

Author: dwijnand

core/src/main/scala/com/typesafe/tools/mima/core/Settings.scala

@@ -14,8 +14,6 @@ class Settings(specificOptions: String*) extends nsc.Settings(Console.println) {
   val mimaOutDir = StringSetting("-d", "directory", "Specify where to place generated class files", "(change existing)")
   val fixall = BooleanSetting("-fixall", "Fix without asking")
 
-  allSettings ++= Seq(interactive, mimaOutDir)
-
   def visibleNames =
     List(
       "-bootclasspath",