module RailsAdmin
  module Extensions
    module PaperTrail
      class VersionProxy
        def message
           @message = @version.event
         end
        def version_id
          @version.id
        end
      end
    end
  end
end

module RailsAdmin
  module Extensions
    module PaperTrail
      class VersionProxy
        def message
           @message = @version.event
         end
        def version_id
          @version.id
        end
      end
      class AuditingAdapter
        COLUMN_MAPPING[:rollback] = :id
      end
    end
  end
end

--- 
+++ 
@@ -9,9 +9,6 @@
           @version.id
         end
       end
-      class AuditingAdapter
-        COLUMN_MAPPING[:rollback] = :id
-      end
     end
   end
 end
Fix issue with frozen constants in RailsAdmin at v1.0.0

Fixes #17
