add gh-pages v2 link to readme

Author: pwfisher

README.md

@@ -4,7 +4,7 @@ explodingdog explorer. An alternate explodingdog experience.
 
 v1 is still live, but the images are broken: [explodingdog.herokuapp.com](https://explodingdog.herokuapp.com).
 
-v2 is under `/explorer`.
+v2 is under `/explorer` and online at [pwfisher.github.io/explodingdog/](https://pwfisher.github.io/explodingdog/)
 
 # explodingdog-scraper