Update README.md

Author: stefan-ka

README.md

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 # A Java Library to Serialize Protocol Buffer Files
-[![Build Status](https://travis-ci.com/Microservice-API-Patterns/protobufgen.svg?branch=master)](https://travis-ci.com/Microservice-API-Patterns/protobufgen) [![codecov](https://codecov.io/gh/stefan-ka/protobufgen/branch/master/graph/badge.svg)](https://codecov.io/gh/stefan-ka/protobufgen) [![Maven Central](https://img.shields.io/maven-central/v/io.github.stefan-ka/protobufgen.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:%22io.github.stefan-ka%22%20AND%20a:%22protobufgen%22) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![Build Status](https://travis-ci.com/Microservice-API-Patterns/protobufgen.svg?branch=master)](https://travis-ci.com/Microservice-API-Patterns/protobufgen) [![codecov](https://codecov.io/gh/Microservice-API-Patterns/protobufgen/branch/master/graph/badge.svg)](https://codecov.io/gh/Microservice-API-Patterns/protobufgen) [![Maven Central](https://img.shields.io/maven-central/v/io.github.stefan-ka/protobufgen.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:%22io.github.stefan-ka%22%20AND%20a:%22protobufgen%22) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
 This is a simple Java library containing a [protocol buffer](https://developers.google.com/protocol-buffers) model and serializer. It can be used in case you want to generate [\*.proto files](https://developers.google.com/protocol-buffers/docs/proto3) within a Java application. We currently support [proto3](https://developers.google.com/protocol-buffers/docs/proto3) only.