use old hashrocket syntax

spec/models/thing_spec.rb

@@ -4,7 +4,7 @@ describe Thing, :type => :model do
   it { is_expected.to be_versioned }
 
   describe "should not store object_changes", :versioning => true do
-    let(:thing) { Thing.create(name: "pencil") }
+    let(:thing) { Thing.create(:name =>"pencil") }
 
     it { expect(thing.versions.last.object_changes).to be_nil }
   end

test/dummy/app/models/thing.rb

@@ -1,3 +1,3 @@
 class Thing < ActiveRecord::Base
-  has_paper_trail save_changes: false
+  has_paper_trail :save_changes => false
 end