Update dependency versions and cross-compile to Scala 2.12

.travis.yml

@@ -1,7 +1,7 @@
 language: scala
-script: mvn test
 scala:
   - 2.11.8
+  - 2.12.1
 jdk:
   - oraclejdk8
 services:

build.sbt

@@ -1,24 +1,26 @@
 name := "amqp-client"
 
 organization := "com.github.sstone"
- 
+
 version := "1.5-SNAPSHOT"
-
-scalaVersion := "2.11.7"
 
-scalacOptions  ++= Seq("-feature", "-language:postfixOps")
-
+scalaVersion := "2.12.1"
+
+crossScalaVersions := Seq("2.11.8", "2.12.1")
+
+scalacOptions ++= Seq("-feature", "-language:postfixOps")
+
 resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/"
 
-libraryDependencies <<= scalaVersion { scala_version => 
-    val akkaVersion   = "2.3.11"
-    Seq(
-        "com.rabbitmq"         % "amqp-client"          % "3.5.2",
-        "com.typesafe.akka"    %% "akka-actor"          % akkaVersion % "provided",
-        "com.typesafe.akka"    %% "akka-slf4j"          % akkaVersion % "test",
-        "com.typesafe.akka"    %% "akka-testkit"        % akkaVersion  % "test",
-        "org.scalatest"        %% "scalatest"           % "2.2.5" % "test",
-        "ch.qos.logback"       %  "logback-classic"     % "1.1.2" % "test",
-        "junit"           	   % "junit"                % "4.12" % "test"
-    )
+libraryDependencies ++= {
+  val akkaVersion = "2.4.17"
+  Seq(
+    "com.rabbitmq"         % "amqp-client"          % "4.1.0",
+    "com.typesafe.akka"    %% "akka-actor"          % akkaVersion % "provided",
+    "com.typesafe.akka"    %% "akka-slf4j"          % akkaVersion % "test",
+    "com.typesafe.akka"    %% "akka-testkit"        % akkaVersion % "test",
+    "org.scalatest"        %% "scalatest"           % "3.0.1" % "test",
+    "ch.qos.logback"       % "logback-classic"      % "1.2.1" % "test",
+    "junit"           	   % "junit"                % "4.12" % "test"
+  )
 }

project/build.properties

@@ -0,0 +1 @@
+sbt.version=0.13.13

project/plugins.sbt

@@ -2,4 +2,4 @@ resolvers += "Sonatype snapshots" at "http://oss.sonatype.org/content/repositori
 
 addSbtPlugin("com.github.mpeltonen" % "sbt-idea" % "1.6.0")
 
-addSbtPlugin("com.github.gseitz" % "sbt-release" % "0.8")
+addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.4")

src/test/scala/com/github/sstone/amqp/ChannelOwnerSpec.scala

@@ -14,7 +14,7 @@ import com.github.sstone.amqp.ChannelOwner.NotConnectedError
 import scala.concurrent.Await
 
 @RunWith(classOf[JUnitRunner])
-class ChannelOwnerSpec extends ChannelSpec  {
+class ChannelOwnerSpec extends ChannelSpec {
   "ChannelOwner" should {
 
     "implement basic error handling" in {

src/test/scala/com/github/sstone/amqp/ChannelSpec.scala

@@ -1,19 +1,18 @@
 package com.github.sstone.amqp
 
 import akka.testkit.{ImplicitSender, TestKit}
-import akka.actor.{ActorRef, Props, ActorSystem}
+import akka.actor.{ActorRef, ActorSystem, Props}
 import akka.util.Timeout
 import akka.pattern.{ask, gracefulStop}
-import org.scalatest.{BeforeAndAfter, WordSpecLike}
-import org.scalatest.matchers.ShouldMatchers
+import org.scalatest.{BeforeAndAfter, Matchers, WordSpecLike}
 import java.util.concurrent.TimeUnit
 import scala.concurrent.Await
 import scala.concurrent.duration._
 import com.rabbitmq.client.ConnectionFactory
 import com.github.sstone.amqp.Amqp._
 import scala.util.Random
 
-class ChannelSpec extends TestKit(ActorSystem("TestSystem")) with WordSpecLike with ShouldMatchers with BeforeAndAfter with ImplicitSender {
+class ChannelSpec extends TestKit(ActorSystem("TestSystem")) with WordSpecLike with Matchers with BeforeAndAfter with ImplicitSender {
   implicit val timeout = Timeout(5 seconds)
   val connFactory = new ConnectionFactory()
   val uri = system.settings.config.getString("amqp-client-test.rabbitmq.uri")

src/test/scala/com/github/sstone/amqp/ConnectionOwnerSpec.scala

@@ -1,7 +1,6 @@
 package com.github.sstone.amqp
 
-import org.scalatest.matchers.ShouldMatchers
-import org.scalatest.WordSpecLike
+import org.scalatest.{Matchers, WordSpecLike}
 import org.junit.runner.RunWith
 import org.scalatest.junit.JUnitRunner
 import akka.testkit.{ImplicitSender, TestKit, TestProbe}
@@ -10,13 +9,13 @@ import akka.pattern.gracefulStop
 import akka.util.Timeout
 import concurrent.duration._
 import concurrent.Await
-import com.rabbitmq.client.{ConnectionFactory, Address, Channel}
+import com.rabbitmq.client.{Address, Channel, ConnectionFactory}
 import Amqp._
 import ConnectionOwner.{Connected, CreateChannel, Disconnected}
 import java.util.concurrent.TimeUnit
 
 @RunWith(classOf[JUnitRunner])
-class ConnectionOwnerSpec extends TestKit(ActorSystem("TestSystem")) with WordSpecLike with ShouldMatchers with ImplicitSender {
+class ConnectionOwnerSpec extends TestKit(ActorSystem("TestSystem")) with WordSpecLike with Matchers with ImplicitSender {
   implicit val timeout = Timeout(5 seconds)
 
   "ConnectionOwner" should {