shields.io Maven badges; show 2.10 and 2.11 builds

Author: retronym

README.md

@@ -1,4 +1,4 @@
-## scala-java8-compat [<img src="https://api.travis-ci.org/scala/scala-java8-compat.png"/>](https://travis-ci.org/scala/scala-java8-compat) [![Maven Central 2.11](https://maven-badges.herokuapp.com/maven-central/org.scala-lang.modules/scala-java8-compat_2.11/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.scala-lang.modules/scala-java8-compat_2.11)
+## scala-java8-compat [<img src="https://api.travis-ci.org/scala/scala-java8-compat.png"/>](https://travis-ci.org/scala/scala-java8-compat) [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-java8-compat_2.10.svg?label=latest%20release%20for%202.10"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-java8-compat_2.10) [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-java8-compat_2.11*.svg?label=latest%20release%20for%202.11"/>](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-java8-compat_2.11*)
 
 A Java 8 compatibility kit for Scala.