Add the Northern Ireland bit back in

Wow, I totally missed the second licence. That'll teach me to edit in the browser, with funny text wrap…

app/views/static/about.html.erb

@@ -8,7 +8,7 @@
 
 <h2>Licensing</h2>
 
-Great Britain postcode data may be used under the terms of the <a href="http://www.ordnancesurvey.co.uk/business-and-government/licensing/using-creating-data-with-os-products/os-opendata.html">ONSPD licence</a></p>
+Great Britain postcode data may be used under the terms of the <a href="http://www.ordnancesurvey.co.uk/business-and-government/licensing/using-creating-data-with-os-products/os-opendata.html">OS OpenData licence</a>. Northern Ireland postcode data may be used under the terms of the <a href="http://www.ons.gov.uk/ons/guide-method/geography/products/postcode-directories/-nspp-/onspd-open-licence.doc">ONSPD licence</a>
 
 <h2>Support</h2>