Add (Last) Updated information to the EIP/ERC page

[Vid201]

Proposed Change

EIP proposals are being updated on the on-going basis until they are accepted/rejected. It would be useful to have some information about the date of the last change so it's easier to see on the website if there were any changes to the proposal recently.

Not sure how hard would be to parse that from the git commit history.

[fulldecent]

Jekyll doesn't support this, so probably this will not be implemented.

[SamWilsn]

If you're okay waiting an unspecified amount of time, this is mostly taken care of in my working groups demo (preview).

[github-actions]

There has been no activity on this issue for 1 week. It will be closed after 3 months of inactivity.