Update README.md

Author: frozenfung

README.md

@@ -204,7 +204,7 @@ commits and tags, and push the `.gem` file to
 
 ## Contributing
 
-1. Fork it ( https://github.com/[my-github-username]/hypernova/fork )
+1. Fork it ( https://github.com/airbnb/hypernova-ruby/fork )
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Commit your changes (`git commit -am 'Add some feature'`)
 4. Push to the branch (`git push origin my-new-feature`)