adjusted readme

Author: Max Scholz

README.MD

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-[![Build Status](https://travis-ci.org/Staffbase/plugins-sdk-nodejs.svg?branch=master)](https://travis-ci.org/Staffbase/plugins-sdk-nodejs) [![Greenkeeper badge](https://badges.greenkeeper.io/Staffbase/plugins-sdk-nodejs.svg)](https://greenkeeper.io/)
+[![Build Status](https://travis-ci.org/Staffbase/plugins-sdk-nodejs.svg?branch=master)](https://travis-ci.org/Staffbase/plugins-sdk-nodejs)
 # Staffbase Plugins SDK for Node.js.
 
 If you are developing your own plugin for your Staffbase app we describe the authentication flow of a plugin at https://developers.staffbase.com/api/plugin-sso/. While this documentation just covers the conceptual ideas of the interface of plugins though – the so called Plugin SSO – we want to provide a library to help you develop your first plugin for Staffbase even faster. This SDK provides the basic functionality to parse and verify a provided token for Node.js.