Add EIP-684 to Byzantium Meta

[soc1c]

fix #2220

to my knowledge, all clients implement it

[axic]

There is a discussion in https://ethereum-magicians.org/t/eip-689-address-collision-of-contract-address-causes-exceptional-halt/3542 about this. I think we should do what was suggested in that discussion and then merge this.

I'd be against merging this PR as-is because currently all the "hard fork metas" are somewhat of a higher quality with linking to well-formatted EIPs. Compared to that this PR would link to a non-EIP-formatted link.

[axic]

I think we should make 684 into an EIP and not linking to an issue here.

[github-actions]

There has been no activity on this pull request for two months. It will be closed in a week if no further activity occurs. If you would like to move this EIP forward, please respond to any outstanding feedback or add a comment indicating that you have addressed all required feedback and are ready for a review.

[github-actions]

This pull request was closed due to inactivity. If you are still pursuing it, feel free to reopen it and respond to any feedback or request a review in a comment.

[hacker-DOM]

Imho something is better than nothing. It's confusing that 684 is not listed among Byzantium EIPs, even though it was part of it