Update README.md

Author: stefan-ka

README.md

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 # Graphical DDD Context Map Generator
 [![Build Status](https://travis-ci.com/ContextMapper/context-map-generator.svg?branch=master)](https://travis-ci.com/ContextMapper/context-map-generator) [![codecov](https://codecov.io/gh/ContextMapper/context-map-generator/branch/master/graph/badge.svg)](https://codecov.io/gh/ContextMapper/context-map-generator) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![Maven Central](https://img.shields.io/maven-central/v/org.contextmapper/context-map-generator.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:%22org.contextmapper%22%20AND%20a:%22context-map-generator%22)
 
-This repository contains a Java library to generate graphical DDD Context Maps inspired by [Brandolini](https://www.infoq.com/articles/ddd-contextmapping/) and [Vernon](https://www.amazon.de/Implementing-Domain-Driven-Design-Vaughn-Vernon/dp/0321834577). The generation of the Context Maps is based on [Graphviz](https://www.graphviz.org/) and used within the [Context Mapper](https://contextmapper.org) tool.
+This repository contains a Java library to generate graphical DDD Context Maps inspired by [Brandolini](https://www.infoq.com/articles/ddd-contextmapping/) and [Vernon](https://www.amazon.de/Implementing-Domain-Driven-Design-Vaughn-Vernon/dp/0321834577). The generation of the Context Maps is based on [Graphviz](https://www.graphviz.org/), [graphviz-java](https://github.com/nidi3/graphviz-java), and used within the [Context Mapper](https://contextmapper.org) tool.
 
 ## Usage
 The library is published to [Maven central](https://search.maven.org/search?q=g:%22org.contextmapper%22%20AND%20a:%22context-map-generator%22) and as an Eclipse feature to a [P2 repository](https://dl.bintray.com/contextmapper/context-map-generator-releases/).