update readme

README.md

@@ -75,7 +75,7 @@ The maintainers of RFCs and the community will review the PR, and you should upd
 | [17](rfcs/0017-tx-valid-since) | [Transaction valid since](rfcs/0017-tx-valid-since/0017-tx-valid-since.md) | Jinyang Jiang | Standards Track | Proposal
 | [19](rfcs/0019-data-structures) | [Data Structures](rfcs/0019-data-structures/0019-data-structures.md) | Xuejie Xiao | Informational | Draft
 | [20](rfcs/0020-ckb-consensus-protocol) | [CKB Consensus Protocol](rfcs/0020-ckb-consensus-protocol/0020-ckb-consensus-protocol.md) | Ren Zhang | Informational | Draft
-| [21](rfcs/0021-ckb-address-format) | [CKB Address Format](rfcs/0021-ckb-address-format/0021-ckb-address-format.md) | Cipher Wang | Standards Track | Proposal
+| [21](rfcs/0021-ckb-address-format) | [CKB Address Format](rfcs/0021-ckb-address-format/0021-ckb-address-format.md) | Cipher Wang, Axel Wan | Standards Track | Active
 | [22](rfcs/0022-transaction-structure) | [CKB Transaction Structure](rfcs/0022-transaction-structure/0022-transaction-structure.md) | Ian Yang | Informational | Draft
 | [23](rfcs/0023-dao-deposit-withdraw) | [Deposit and Withdraw in Nervos DAO](rfcs/0023-dao-deposit-withdraw/0023-dao-deposit-withdraw.md) | Jan Xie, Xuejie Xiao, Ian Yang | Standards Track | Proposal
 | [24](rfcs/0024-ckb-system-script-list) | [CKB System Script List](rfcs/0024-ckb-system-script-list/0024-ckb-system-script-list.md) | Dylan Duan | Informational | Draft