Update README.md (#466)

Author: seratch

README.md

@@ -1,7 +1,10 @@
+## ⚠️ Important Notice ⚠️
+
+This library is no longer maintained. If you would like to continue using it, please fork and update it on your own.
+
 AWScala: AWS SDK on the Scala REPL
 =======
 
-[![Build Status](https://travis-ci.org/seratch/AWScala.svg)](https://travis-ci.org/seratch/AWScala)
 [![Maven Central](https://img.shields.io/maven-central/v/com.github.seratch/awscala_2.13.svg?label=Maven%20Central)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.github.seratch%22%20a%3A%22awscala_2.13%22)
 
 AWScala enables Scala developers to easily work with Amazon Web Services in the Scala way.