Bump petrify gem ref

Gemfile

@@ -3,6 +3,6 @@ source 'https://rubygems.org'
 ruby '>=2.3'
 
 gem 'scraperwiki', :git => 'https://github.com/openaustralia/scraperwiki-ruby/', :branch => 'morph_defaults'
-gem 'petrify', :git => 'https://github.com/adrianshort/petrify/'
+gem 'petrify', :git => 'https://github.com/adrianshort/petrify/', :ref => '04aa25b'
 gem 'rest-client'
 gem 'json'

Gemfile.lock

@@ -1,8 +1,9 @@
 GIT
   remote: https://github.com/adrianshort/petrify/
-  revision: 4f949558e20767fc88acd18e523c2e95a4173475
+  revision: 04aa25b008188086ed1f4c79ebebfc9f6cbbd75d
+  ref: 04aa25b
   specs:
-    petrify (0.1.0)
+    petrify (0.3.0)
       haml
 
 GIT