Drop Scala 2.10

.travis.yml

@@ -1,4 +1,2 @@
 language: scala
-scala:
+scala: 2.11.8
-   - 2.10.6
-   - 2.11.8

build.sbt

@@ -13,7 +13,7 @@ def commonSettings: Seq[Setting[_]] = Seq(
   // concurrentRestrictions in Global += Util.testExclusiveRestriction,
   testOptions += Tests.Argument(TestFrameworks.ScalaCheck, "-w", "1"),
   javacOptions in compile ++= Seq("-target", "6", "-source", "6", "-Xlint", "-Xlint:-serial"),
-  crossScalaVersions := Seq(scala210, scala211),
+  crossScalaVersions := Seq(scala211),
   scalacOptions ++= Seq("-Ywarn-unused", "-Ywarn-unused-import"),
   previousArtifact := None, // Some(organization.value %% moduleName.value % "1.0.0"),
   publishArtifact in Compile := true,
@@ -66,9 +66,7 @@ lazy val utilCollection = (project in internalPath / "util-collection").
   settings(
     commonSettings,
     Util.keywordsSettings,
-    name := "Util Collection",
+    name := "Util Collection"
-    scalacOptions --= // scalac 2.10 rejects some HK types under -Xfuture it seems..
-      (CrossVersion partialVersion scalaVersion.value collect { case (2, 10) => "-Xfuture" }).toList
   )
 
 lazy val utilApplyMacro = (project in internalPath / "util-appmacro").

project/Dependencies.scala

@@ -2,7 +2,6 @@ import sbt._
 import Keys._
 
 object Dependencies {
-  lazy val scala210 = "2.10.6"
   lazy val scala211 = "2.11.8"
   lazy val scala212 = "2.12.0-M4"