add target attribute to ghp link

Author: cifarquhar

README.md

@@ -2,7 +2,7 @@
 
 This repository contains the source code for a website listing interesting facts about CYF's host cities. You can use it to practise creating issues and pull requests, and to study the examples which are already here.
 
-You can see the deployed site [here](https://codeyourfuture.github.io/github_issues_prs_practice/).
+You can see the deployed site [here](https://codeyourfuture.github.io/github_issues_prs_practice/){:target="_blank"}.
 
 ## Repository Contents