Updated readme

Author: m-mohr

README.md

@@ -2,9 +2,10 @@
 
 JavaScript client for the openEO API.
 
-[![Status](https://img.shields.io/badge/Status-proof--of--concept-yellow.svg)]()
 [![Build Status](https://travis-ci.org/Open-EO/openeo-js-client.svg?branch=master)](https://travis-ci.org/Open-EO/openeo-js-client)
 
+This client is in **version 0.3.0** and supports **openEO API versions 0.3.0 and 0.3.1**. Legacy versions are available as releases.
+
 ## Usage
 This library can run in a recent browser supporting ECMAScript 2015 or node.js.