Update README.md

Fix workflow badge

README.md

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 # GlobalPlatformPro - _the_ Swiss Army Knife for JavaCard-s
 [![LGPL-3.0 licensed](https://img.shields.io/badge/license-LGPL-blue.svg)](https://github.com/martinpaljak/GlobalPlatformPro/blob/master/LICENSE)
  [![Latest release](https://img.shields.io/github/release/martinpaljak/GlobalPlatformPro.svg)](https://github.com/martinpaljak/GlobalPlatformPro/releases/latest)
- [![Maven version](https://img.shields.io/maven-metadata/v?label=javacard.pro%20version&metadataUrl=https%3A%2F%2Fjavacard.pro%2Fmaven%2Fcom%2Fgithub%2Fmartinpaljak%2Fglobalplatformpro%2Fmaven-metadata.xml)](https://gist.github.com/martinpaljak/c77d11d671260e24eef6c39123345cae)
- [![Build status](https://github.com/martinpaljak/globalplatformpro/workflows/Build%20robot/badge.svg?branch=master)](https://github.com/martinpaljak/globalplatformpro/actions)
+ [![Maven version](https://img.shields.io/maven-metadata/v?label=javacard.pro%20version&metadataUrl=https%3A%2F%2Fmvn.javacard.pro%2Fmaven%2Fcom%2Fgithub%2Fmartinpaljak%2Fglobalplatformpro%2Fmaven-metadata.xml)](https://gist.github.com/martinpaljak/c77d11d671260e24eef6c39123345cae)
+ [![Build status](https://github.com/martinpaljak/globalplatformpro/actions/workflows/robot.yml/badge.svg?branch=master)](https://github.com/martinpaljak/globalplatformpro/actions)
  [![Made in Estonia](https://img.shields.io/badge/Made_in-Estonia-blue)](https://estonia.ee)
 
 Load and manage applets and keys on JavaCards from command line or from your Java project with a [Do What I Mean](http://en.wikipedia.org/wiki/DWIM) approach ([testimonials](https://github.com/martinpaljak/GlobalPlatformPro/wiki/Testimonials)).