Cross compile the project (#63)

.travis.yml

@@ -1,7 +1,8 @@
 language: scala
 scala:
-  - 2.11.1
+  - 2.12.2
+  - 2.11.11
 jdk:
   - oraclejdk8
 notifications:
-  email: false
+  email: false

README.md

@@ -1,5 +1,5 @@
 # Google's HTML (and XML) Compressor for Play Framework 2 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.mohiva/play-html-compressor_2.11/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.mohiva/play-html-compressor_2.11) [![Build Status](https://travis-ci.org/mohiva/play-html-compressor.png)](https://travis-ci.org/mohiva/play-html-compressor)
-[![Gitter](https://badges.gitter.im/Join Chat.svg)](https://gitter.im/mohiva/play-html-compressor?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/mohiva/play-html-compressor?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 ## Installation
 

build.sbt

@@ -64,7 +64,7 @@ pomExtra := pom
 
 scalaVersion := "2.12.2"
 
-crossScalaVersions := Seq("2.11.11")
+crossScalaVersions := Seq("2.12.2", "2.11.11")
 
 scalacOptions ++= Seq(
   "-deprecation", // Emit warning and location for usages of deprecated APIs.