message: Add hack library and fix links
diff: @@ -71,7 +71,9 @@ $ npm test
  7. [R Library](https://github.com/erzk/PostcodesioR) by [Eryk Walczak](http://walczak.org). Read the [blog post](http://walczak.org/2016/07/postcode-and-geolocation-api-for-the-uk/).
  -8. [Google Sheets Addon] (https://chrome.google.com/webstore/detail/uk-postcode-geocoder/bjkecdilmiedfkihpgfhfikchkghliia?utm_source=permalink) by [Ed Patrick] (http://edwebdeveloper.com/)
  +8. [Hack Library](https://github.com/Matt-Barber/HackPostcodes) HackPostcodes by [Matt Barber](https://recursiveiterator.wordpress.com/)
  +
  +9. [Google Sheets Addon](https://chrome.google.com/webstore/detail/uk-postcode-geocoder/bjkecdilmiedfkihpgfhfikchkghliia?utm_source=permalink) by [Ed Patrick] (http://edwebdeveloper.com/)
  ## License
  