Widget per la riga del titolo superiore ai post

post_header.dart

return Row(
  children: <Widget>[
    CircleAvatar(
      backgroundImage: CachedNetworkImageProvider(
        post.author.photoUrl,
      ),
    ),
    Expanded(
      child: Text(post.author.displayName),
    ),
    Text(format(post.dateTime)),
    IconButton(
      icon: Icon(Icons.more_vert),
      onPressed: showMenu,
    ),
);