Update author format to preferred name + GitHub username format, Vitalik

[fulldecent]

Updating EIPs from this author to use preferred author citation format.

REFERENCES:

• EIP template (uses name + GitHub username) https://github.com/ethereum/EIPs/blob/master/eip-template.md
• Invitation for PR from editor @axic Update EIP to refer to Ethereum Mainnet, wording as per EIP-2228 #4530 (comment)

[eth-bot]

Hi! I'm a bot, and I wanted to automerge your PR, but couldn't because of the following issue(s):

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(fail) EIPS/eip-101.md

• eip-101.md has no identifiable authors who can approve the PR (only considering the base version)

(fail) EIPS/eip-198.md

• eip-198.md has no identifiable authors who can approve the PR (only considering the base version)

(fail) EIPS/eip-2.md

• eip-2.md has no identifiable authors who can approve the PR (only considering the base version)

(fail) EIPS/eip-7.md

• eip-7.md has no identifiable authors who can approve the PR (only considering the base version)

[axic]

Fine from me, but probably @vbuterin should give a nod too.

[axic]

@MicahZoltu @lightclient if you think this can merged as-is, please do. I think it should be fine as the author is identifyable, but this is a retroactive application of the EIP-1 rule if enforced by an editor.

[MicahZoltu]

Normally I am not a fan of changing the author line without author approval, but in this case the author is a high profile individual and their recent EIPs use the GitHub syntax suggesting that they are generally OK with that over their email address so I am willing to make an exception here.