New NFT signature requires timestamp

[estebanabaroa]

The NFT signatures have changed to

  messageThatShouldBeSigned.domainSeparator = 'plebbit-author-avatar'
  messageThatShouldBeSigned.authorAddress = authorAddress
  messageThatShouldBeSigned.timestamp = nft.timestamp
  messageThatShouldBeSigned.tokenAddress =  nft.address
  messageThatShouldBeSigned.tokenId = String(nft.id)

which is documented here https://github.com/plebbit/plebbit-js/blob/master/docs/nft.md

The current signature creator doesnt have the updated data:

{"domainSeparator":"plebbit-author-avatar","tokenAddress":"0x890a2e81836e0e76e0f49995e6b51ca6ce6f39ed","tokenId":"105","authorAddress":"estebanabaroa.eth"}

It is missing timestamp and also the order is incorrect. authorAddress is now second after domainSeparator.