Change date can have notes

[michelesalvador]

According to the GEDCOM 5.5 and 5.5.1 specifications, the CHANGE_DATE structure can include some NOTE_STRUCTURE. For example:

1 CHAN
2 DATE 20 OCT 2018
3 TIME 22:08:57
2 NOTE @N1@
2 NOTE In-line note to the change date

So the org.folg.gedcom.model.Change should extend NoteContainer instead of ExtensionContainer.