Add missing version attribute on root Element

ERP5Diff.py

@@ -440,6 +440,9 @@ class ERP5Diff:
       if self._result is not None:
         self._result.close()
       self._result = impl.createDocument(self._ns, 'xupdate:modifications', None)
+      attr_version = self._result.createAttributeNS(self._ns, 'version')
+      attr_version.value = '1.0'
+      self._result.documentElement.setAttributeNodeNS(attr_version)
       if self._testElements(old_root_element, new_root_element):
         self._testAttributes(old_root_element, new_root_element, '/')
         self._compareChildNodes(old_root_element, new_root_element, '/')