Update ERC-5521: Move to Last Call

ERCS/erc-5521.md

@@ -4,7 +4,8 @@ title: Referable NFT
 description: An ERC-721 extension to construct reference relationships among NFTs
 author: Saber Yu (@OniReimu), Qin Wang <qin.wang@data61.csiro.au>, Shange Fu <shange.fu@monash.edu>, Yilin Sai <yilin.sai@data61.csiro.au>, Shiping Chen <shiping.chen@data61.csiro.au>, Sherry Xu <xiwei.xu@data61.csiro.au>, Jiangshan Yu <jiangshan.yu@monash.edu>
 discussions-to: https://ethereum-magicians.org/t/eip-x-erc-721-referable-nft/10310
-status: Review
+status: Last Call
+last-call-deadline: 2024-04-16
 type: Standards Track
 category: ERC
 created: 2022-08-10
@@ -29,7 +30,7 @@ By adding the `referring` indicator, users can mint new NFTs (e.g., C, D, E) by
 
 The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in RFC 2119.
 
-- `Relationship`: a structure that contains `referring`, `referred`, `referringKeys`, `referredKeys`, `createdTimestamp`, and other customized and **OPTIONAL** attributes (i.e., not necessarily included in the standard) such as `privityOfAgreement` recording the ownerships of referred NFTs at the time the rNFTs were being created or `profitSharing` recording the profit sharing of `referring`.
+- `Relationship`: a structure that contains `referring`, `referred`, `referringKeys`, `referredKeys`, `createdTimestamp`, and other customized and **OPTIONAL** attributes (i.e., not necessarily included in the standard) such as `privityOfAgreement` recording the ownerships of referred NFTs at the time the Referable NFTs (rNFTs) were being created or `profitSharing` recording the profit sharing of `referring`.
 - `referring`: an out-degree indicator, used to show the users this NFT refers to;
 - `referred`: an in-degree indicator, used to show the users who have refereed this NFT;
 - `referringKeys`: a helper for mapping conversion of out-degree indicators, used for events;