Update README.md

Author: kwarunek

README.md

@@ -59,7 +59,7 @@ docker run -d --name docker-registry-proxy --net=host \
   -e ENABLE_SSL=true \
   -e SSL_KEY=/opt/ssl/key.pem \
   -e SSL_CERTIFICATE=/opt/ssl/certificate.pem \
- ghcr.io/dreamlab/aws-ecr-http-proxy:2.0.0
+ ghcr.io/dreamlab/aws-ecr-http-proxy:master
 ```
 
 If you ran this command on "registry-proxy.example.com" you can now get your images using `docker pull registry-proxy.example.com:5000/repo/image`.