Fix 2.12+ MiMa errors

- method oneOf(Seq)Gen in object Gen's type is different in current
  version, where it is (immutable.Seq)Gen instead of (Seq)Gen
- method sequence(Traversable,util.Buildable)Gen in object Gen's type
  is different in current version, where it is
  (Iterable,util.Buildable)Gen instead of
  (Traversable,util.Buildable)Gen
- method properties()Seq in class Properties has a different result
  type in current version, where it is immutable.Seq rather than Seq
- method checkProperties(Test#Parameters,Properties)Seq in object Test
  has a different result type in current version, where it is
  immutable.Seq rather than Seq
- method
  canCreateNewSut(java.lang.Object,Traversable,Traversable)Boolean in
  interface commands.Commands's type is different in current version,
  where it is (java.lang.Object,Iterable,Iterable)Boolean instead of
  (java.lang.Object,Traversable,Traversable)Boolean
- abstract method
  canCreateNewSut(java.lang.Object,Iterable,Iterable)Boolean in
  interface commands.Commands is present only in current version
- method fromIterable(Traversable)java.lang.Object in interface
  util.Buildable's type is different in current version, where it is
  (Iterable)java.lang.Object instead of (Traversable)java.lang.Object

Author: ashawley

project/MimaSettings.scala

@@ -12,10 +12,13 @@ object MimaSettings {
       removedPrivateMethods.map(exclude[DirectMissingMethodProblem](_)) ++
       newMethods.map(exclude[ReversedMissingMethodProblem](_)) ++
       removedPrivateClasses.map(exclude[MissingClassProblem](_)) ++
+      methodTypeChanges.map(exclude[IncompatibleMethTypeProblem](_)) ++
+      returnTypeChanges.map(exclude[IncompatibleResultTypeProblem](_)) ++
       otherProblems
   )
 
   private def newMethods = Seq(
+    "org.scalacheck.commands.Commands.canCreateNewSut"
   )
 
   private def removedPrivateMethods = Seq(
@@ -25,6 +28,18 @@ object MimaSettings {
     "org.scalacheck.Platform$EnableReflectiveInstantiation"
   )
 
+  private def methodTypeChanges = Seq(
+    "org.scalacheck.Gen.oneOf",
+    "org.scalacheck.Gen.sequence",
+    "org.scalacheck.commands.Commands.canCreateNewSut",
+    "org.scalacheck.util.Buildable.fromIterable"
+  )
+
+  private def returnTypeChanges = Seq(
+    "org.scalacheck.Properties.properties",
+    "org.scalacheck.Test.checkProperties"
+  )
+
   private def otherProblems = Seq(
   )