Update readme: add link to Docker

README.md

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 # Shiori
 
 [![Go Report Card](https://goreportcard.com/badge/github.com/go-shiori/shiori)](https://goreportcard.com/report/github.com/go-shiori/shiori)
-[![Donate](https://img.shields.io/badge/donate-PayPal-green.svg)](https://www.paypal.me/RadhiFadlillah)
-[![Donate](https://img.shields.io/badge/donate-Ko--fi-brightgreen)](https://ko-fi.com/radhifadlillah)
+[![Docker Image](https://img.shields.io/static/v1?label=image&message=Docker&color=1488C6&logo=docker)](https://hub.docker.com/r/radhifadlillah/shiori)
+[![Donate PayPal](https://img.shields.io/static/v1?label=donate&message=PayPal&color=00457C&logo=paypal)](https://www.paypal.me/RadhiFadlillah)
+[![Donate Ko-fi](https://img.shields.io/static/v1?label=donate&message=Ko-fi&color=F16061&logo=ko-fi)](https://ko-fi.com/radhifadlillah)
 
 Shiori is a simple bookmarks manager written in Go language. Intended as a simple clone of [Pocket](https://getpocket.com//). You can use it as command line application or as web application. This application is distributed as a single binary, which means it can be installed and used easily.