Update release date in CHANGELOG.md

Author: larskanis

rakelib/pg_gem_helper.rb

@@ -21,7 +21,7 @@ def hfile
   end
 
   def headline
-    '([^\w]*)v(\d+\.\d+\.\d+(?:\.\w+)?)([^\w]+)([2Y][0Y][0-9Y][0-9Y]-[0-1M][0-9M]-[0-3D][0-9D])([^\w]*|$)'
+    '(##([^\w]*)v\d+\.\d+\.\d+(?:\.\w+)?)([^\w]+)([2Y][0Y][0-9Y][0-9Y]-[0-1M][0-9M]-[0-3D][0-9D])([^\w]*|$)'
   end
 
   def reldate