message: Add hack library
diff: @@ -84,6 +84,13 @@ block content
  | . Read the
  a(href="http://walczak.org/2016/07/postcode-and-geolocation-api-for-the-uk/") blog post
  + p
  + strong Hack
  + p
  + a(href="https://github.com/Matt-Barber/HackPostcodes") HackPostcodes
  + | by
  + a(href="https://recursiveiterator.wordpress.com/") Matt Barber
  +
  p
  strong Google Sheets Addon
  p
  