Fix build for Scala 2.12

Scala 2.10.6 is the only version we now support that still
supports/requires JVM 1.7, so this is now exclusively a special-case.

jdbi/src/test/scala/com/datasift/dropwizard/scala/jdbi/tweak/BigDecimalArgumentFactorySpec.scala

@@ -3,10 +3,10 @@ package com.datasift.dropwizard.scala.jdbi.tweak
 import java.sql.{Types, PreparedStatement}
 
 import org.scalatest.FlatSpec
-import org.scalatest.mock.MockitoSugar
+import org.scalatest.mockito.MockitoSugar
 import org.skife.jdbi.v2.StatementContext
 import org.mockito.Mockito._
-import org.mockito.Matchers.{eq => equalTo}
+import org.mockito.ArgumentMatchers.{eq => equalTo}
 
 class BigDecimalArgumentFactorySpec extends FlatSpec with MockitoSugar {
 

metrics/src/test/scala/com/datasift/dropwizard/scala/MetricImplicitsSpec.scala

@@ -87,7 +87,7 @@ class MetricImplicitsSpec extends FlatSpec {
   "Gauge" should "be transformable by another function" in {
     val registry = new MetricRegistry
     val gauge = registry.gauge("test.gauge")(50)
-    val transformed = gauge.map(2*)
+    val transformed = gauge.map(2 * _)
     assert(gauge.getValue === 50)
     assert(transformed.getValue === 100)
   }

project/Project.scala

@@ -20,13 +20,7 @@ object CompileOptions {
       "-language:implicitConversions" ::
       "-language:higherKinds" ::
       "-feature" ::
-      (scalaVersion match {
-        case v if v.startsWith("2.11.") && v.stripPrefix("2.11.").toInt > 4 =>
-          "-target:jvm-1.8"
-        case _ =>
-          "-target:jvm-1.7"
-      }) ::
-      Nil
+      (if (scalaVersion.startsWith("2.10.")) "-target:jvm-1.7" :: Nil else Nil)
 
   val java: Seq[String] = Seq("-source", "1.8", "-target", "1.8")
 }