Add Apache 2.0 License badge to README. (#239)
diff --git a/README.md b/README.md
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OpenWhisk API Gateway
=============
[![Build Status](https://travis-ci.org/apache/incubator-openwhisk-apigateway.svg?branch=master)](https://travis-ci.org/apache/incubator-openwhisk-apigateway)
+[![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0)
A performant API Gateway based on Openresty and NGINX.