Fix missing / in blog post

Author: flippmoke

_posts/blog/2015-07-07-release-3.0.0.md

@@ -18,7 +18,7 @@ You can [download the official source](https://mapnik.s3.amazonaws.com/dist/v3.0
 There are two really phenomenal new features of Mapnik 3: text shaping support and "expressions everywhere".
 
 The new text support brings world-class text layout and rendering support to Mapnik for nearly every language (formally `script`) in the world thanks to the powerful [harfbuzz library](http://www.freedesktop.org/wiki/Software/HarfBuzz/). It landed in [this pull](https://github.com/mapnik/mapnik/
-pull/2087) and represents the first official release that includes Herm's work [from GSOC 2013](news/gsoc2012-status9/).
+pull/2087) and represents the first official release that includes Herm's work [from GSOC 2013](/news/gsoc2012-status9/).
 
 The "expressions everywhere" support allows all single styling properties in Mapnik to be data-driven. Previously in Mapnik 2.x only a few properties could be dynamically driven by feature attributes (like `text-name` and `marker-width`). Now every property you know in Mapnik supports expressions and expressions now also support `@variables` that can be passed at render-time.