Fix

Author: andresg4

lib/yaaf/form.rb

@@ -7,7 +7,8 @@ class Form
     include ::ActiveModel::Validations::Callbacks
     include ::ActiveRecord::Transactions
     include ::ActiveModel::Attributes
-    include ::ActiveModel::Attributes::Normalization
+    include ::ActiveModel::Attributes::Normalization if defined?(::ActiveModel::Attributes::Normalization)
+    include ::ActiveRecord::Normalization if defined?(::ActiveRecord::Normalization)
 
     define_model_callbacks :save