Update README.md

Author: joanfabregat

README.md

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 [![Code Inc.](https://img.shields.io/badge/Code%20Inc.-Document%20Cloud-blue)](https://www.codeinc.co)
 [![Docker Image CI](https://github.com/codeinchq/watermarker/actions/workflows/docker-image.yml/badge.svg)](https://github.com/codeinchq/watermarker/actions/workflows/docker-image.yml)
-[![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/codeinchq/watermarker?label=Version&color=red)](https://github.com/codeinchq/watermarker/releases/latest)
+[![Docker Image Version](https://img.shields.io/docker/v/codeinchq/watermarker?sort=semver&label=Docker%20Hub&color=red)](https://hub.docker.com/r/codeinchq/pdf2txt/tags)
+
 
 This repository contains a simple containerized REST API to apply a watermark to an image. The server is written in Javascript and uses the [Jimp](https://www.npmjs.com/package/jimp) library to process the images.