Updated README.md

Author: s1hofmann

README.md

@@ -6,8 +6,8 @@
 |Develop|![Create snapshot release](https://github.com/nut-tree/nut.js/workflows/Create%20snapshot%20release/badge.svg)|
 
 ![Supported node LTS versions](https://img.shields.io/badge/node%40lts-erbium%2C%20fermium-green)
-![Supported node versions](https://img.shields.io/badge/node-15.x.x-green)
-![Supported Electron versions](https://img.shields.io/badge/electron-8.x.x%20--%2012.x.x-green)
+![Supported node versions](https://img.shields.io/badge/node-16.x.x-green)
+![Supported Electron versions](https://img.shields.io/badge/electron-8.x.x%20--%2013.x.x-green)
 
 [![SonarCloud badge](https://sonarcloud.io/api/project_badges/measure?project=nut-tree%3Anut.js&metric=alert_status)](https://sonarcloud.io/dashboard?id=nut-tree%3Anut.js)
 [![SonarCloud Coverage](https://sonarcloud.io/api/project_badges/measure?project=nut-tree%3Anut.js&metric=coverage)](https://sonarcloud.io/component_measures?id=nut-tree%3Anut.js&metric=coverage)
@@ -294,8 +294,3 @@ sudo apt-get install build-essential python libxtst-dev libpng++-dev
 ```
 
 Setups on other distributions might differ.
-
-For reference, please see:
- 
-- [opencv4nodejs](https://github.com/justadudewhohacks/opencv4nodejs#how-to-install)
-- [robotjs](http://robotjs.io/docs/building)