Update readme with link to latest release

Also update the snapshot version.

Author: retronym

README.md

@@ -1,20 +1,16 @@
-# scala-async [![Build Status](https://travis-ci.org/scala/scala-async.svg?branch=master)](https://travis-ci.org/scala/scala-async) [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-async_2.12.svg?label=latest%20release%20for%202.12">](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-async_2.12)
+# scala-async [![Build Status](https://travis-ci.org/scala/scala-async.svg?branch=master)](https://travis-ci.org/scala/scala-async) [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-async_2.12.svg?label=latest%20release%20for%202.12">](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-async_2.12) [<img src="https://img.shields.io/maven-central/v/org.scala-lang.modules/scala-async_2.13.0-RC1.svg?label=latest%20release%20for%202.13.0-RC1">](http://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.scala-lang.modules%20a%3Ascala-async_2.13.0-RC1)
 
 ## Supported Scala versions
 
-This branch (version series 0.10.x) targets Scala 2.12 and 2.13.
-
-Support for Scala 2.11 is [on a branch](https://github.com/scala/scala-async/tree/2.11.x).
-
-Support for Scala 2.10 is [on a branch](https://github.com/scala/scala-async/tree/2.10.x).
+This branch (version series 0.10.x) targets Scala 2.12 and 2.13. `scala-async` us no longer maintained for older versions.
 
 ## Quick start
 
 To include scala-async in an existing project use the library published on Maven Central.
 For sbt projects add the following to your build definition - build.sbt or project/Build.scala:
 
 ```scala
-libraryDependencies += "org.scala-lang.modules" %% "scala-async" % "0.9.7"
+libraryDependencies += "org.scala-lang.modules" %% "scala-async" % "0.10.0"
 ```
 
 For Maven projects add the following to your <dependencies> (make sure to use the correct Scala version suffix

build.sbt

@@ -17,7 +17,7 @@ scalaVersionsByJvm in ThisBuild := {
 name := "scala-async"
 repoName := "async"
 
-version := "0.10.0-SNAPSHOT"
+version := "0.10.1-SNAPSHOT"
 
 libraryDependencies += "org.scala-lang" % "scala-reflect" % scalaVersion.value % "provided"
 libraryDependencies += "org.scala-lang" % "scala-compiler" % scalaVersion.value % "test" // for ToolBox