fix CHANGELOG link

Author: artemp

_posts/blog/2018-03-06-release-3.0.19.md

@@ -9,8 +9,7 @@ category: Mapnik
 
 Latest Mapnik release is [v3.0.19](https://github.com/mapnik/mapnik/releases/tag/v3.0.19).
 
-For more deatail head to  [CHANGELOG](https://github.com/mapnik/mapnik/blob/master/CHANGELOG.md#3019).
-
+For more deatail head to  [CHANGELOG](https://github.com/mapnik/mapnik/blob/v3.0.19/CHANGELOG.md#3019)
 
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