EIP4906: ERC-721 Metadata Update Extension (#4906)
* ERC-721/ERC-1155 Metadata Update Extension
* add discussion link
* EIP4906: typo fix
* EIP4906: change 'requires: 721 or 1155' to '721, 1155'
* EIP4906: change IERC4906MetadataUpdate to IERC4906
* EIP4906: update paragraph format
* remove some trailing white space
* update author
* add Security Considerations
* update requires:165, 721, 1155
* update Motivation
* remove ERC1155 relative description
* update code
* update by SamWilsn's suggestion
* update author
* update Copyright
* update copyright
Co-authored-by: anders <>
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