Update bips.md for 0.18.0
Update bips.md for 0.18.0

Github-Pull: #15763
Rebased-From: 65d2f5d2de37fd64c9cf8d526bab0072774b7b1d

chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin