Update README.md for cosmoshub-4 Delta

[okwme]

These instructions are maybe misleading. Shahan was confident that it's basically impossible to build a full node from scratch today. Is it worth giving these instructions at all if in fact you need a snapshot?

[ValarDragon]

Why can't you use cosmovisor to handle making a full node from hub-4 as the start point?

The hub upgrade didn't include the metadata for auto-binary downloading, but a script can be used to generate the initial upgrades folder

[okwme]

it's tru you can use cosmovisor. During the upgrade we weren't comfortable promoting it as the default upgrade method since there wasn't a feature for backing up your node but it's being tracked here now.

I could look into the script that's needed but I'm afraid that it's moot if it's not possible to sync from genesis of cocmoshub-4 anyway. I haven't found anyone who's been able to successfully sync in the last 6 months.

[alexanderbez]

You should be able to sync from genesis using cosmovisor (assuming nodes are around to serve the data).