Update model.rb.twig

Author: Vincent (Wen Yu) Ge

templates/ruby/lib/container/models/model.rb.twig

@@ -7,6 +7,9 @@ module {{ spec.title | caseUcfirst }}
 {% for property in definition.properties %}
             attr_reader :{{ property.name | caseSnake | escapeKeyword }}
 {% endfor %}
+{% if definition.additionalProperties %}
+                 attr_reader :data
+{% endif %}
 
             def initialize(
 {% for property in definition.properties %}
@@ -68,4 +71,4 @@ module {{ spec.title | caseUcfirst }}
 {% endfor %}
         end
     end
-end
+end