Update README.md

Author: SavvasMisaghMoayyed

README.md

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 [![](https://badge.imagelayers.io/unicon/shibboleth-idp:latest.svg)](https://imagelayers.io/?images=unicon/shibboleth-idp:latest 'image layer analysis')
 
 # Breaking change. This image is now based on OpenJDK Zulu and not Oracle Java.
-Docker Hub images have not yet been updated, but will be soon. Instructions for switching to Oracle Java for local use will be added shortly. See issue-#19 for details and comments.
+Docker Hub images have not yet been updated, but will be soon. Instructions for switching to Oracle Java for local use will be added shortly. See [this issue](https://github.com/Unicon/shibboleth-idp-dockerized/issues/19) for details and comments.
 
 ## Overview
 This Docker image contains a deployed Shibboleth IdP 3.2.1 running on OpenJDK-based Zulu 8 Update 72 and Jetty 9.3.7 running on the latest CentOS 7 base. This image is a base image and should be used to set the configuration with local changes.