Bump Scala to 2.12, ScalaTest to 3.0.1

.travis.yml

@@ -3,5 +3,6 @@ services:
   - rabbitmq
 scala:
   - 2.11.8
+  - 2.12.0
 jdk:
   - oraclejdk8

README.md

@@ -39,7 +39,7 @@ Source.fromPublisher(queue).map(_.message).runWith(Sink.fromSubscriber(exchange)
 
 API Docs
 ----
-Run `sbt doc` and open target/scala-2.11/index.html.
+Run `sbt doc` and open target/scala-2.12/index.html.
 
 Settings
 ----

build.sbt

@@ -14,7 +14,9 @@ licenses := Seq("Apache License 2.0" -> url("http://opensource.org/licenses/Apac
 
 homepage := Some(url("https://github.com/ScalaConsultants/reactive-rabbit"))
 
-scalaVersion := "2.11.8"
+scalaVersion := "2.12.0"
+
+crossScalaVersions := Seq("2.11.8", "2.12.0")
 
 scalacOptions ++= Seq("-unchecked", "-deprecation", "-feature", "-Xfatal-warnings", "-target:jvm-1.8")
 
@@ -25,7 +27,7 @@ libraryDependencies ++= Seq(
   "com.typesafe"             %  "config"                   % "1.3.0",            // Configuration
   "com.google.guava"         %  "guava"                    % "19.0",             // for MediaType
   "com.google.code.findbugs" %  "jsr305"                   % "3.0.1",
-  "org.scalatest"            %% "scalatest"                % "2.2.6"   % "test", // for TCK
+  "org.scalatest"            %% "scalatest"                % "3.0.1"   % "test", // for TCK
   "org.reactivestreams"      %  "reactive-streams-tck"     % "1.0.0"   % "test",
   "com.typesafe.akka"        %% "akka-stream"              % "2.4.12"  % "test"
 )