doc: Mention missing BIP157 in bips.md
doc: Mention missing BIP157 in bips.md

Mention BIP 157, also mention that BIP 158 is active on the P2P network
since v0.21.

achow101/bitcoin,jlopp/statoshi,namecoin/namecore,andreaskern/bitcoin,jamesob/bitcoin,jlopp/statoshi,tecnovert/particl-core,namecoin/namecore,fujicoin/fujicoin,andreaskern/bitcoin,fujicoin/fujicoin,bitcoinknots/bitcoin,ajtowns/bitcoin,lateminer/bitcoin,jambolo/bitcoin,domob1812/bitcoin,GroestlCoin/bitcoin,tecnovert/particl-core,pataquets/namecoin-core,kallewoof/bitcoin,fujicoin/fujicoin,GroestlCoin/GroestlCoin,dscotese/bitcoin,jlopp/statoshi,dscotese/bitcoin,jamesob/bitcoin,kallewoof/bitcoin,ajtowns/bitcoin,sstone/bitcoin,pataquets/namecoin-core,GroestlCoin/bitcoin,pataquets/namecoin-core,GroestlCoin/GroestlCoin,anditto/bitcoin,dscotese/bitcoin,jambolo/bitcoin,jlopp/statoshi,bitcoin/bitcoin,bitcoin/bitcoin,sstone/bitcoin,ajtowns/bitcoin,jamesob/bitcoin,dscotese/bitcoin,sipsorcery/bitcoin,anditto/bitcoin,domob1812/bitcoin,ajtowns/bitcoin,fanquake/bitcoin,bitcoin/bitcoin,lateminer/bitcoin,ajtowns/bitcoin,anditto/bitcoin,fanquake/bitcoin,AkioNak/bitcoin,achow101/bitcoin,Xekyo/bitcoin,andreaskern/bitcoin,tecnovert/particl-core,bitcoinsSG/bitcoin,lateminer/bitcoin,mruddy/bitcoin,instagibbs/bitcoin,bitcoinknots/bitcoin,sipsorcery/bitcoin,AkioNak/bitcoin,fujicoin/fujicoin,fujicoin/fujicoin,tecnovert/particl-core,bitcoinknots/bitcoin,GroestlCoin/GroestlCoin,kallewoof/bitcoin,andreaskern/bitcoin,lateminer/bitcoin,GroestlCoin/bitcoin,achow101/bitcoin,bitcoinsSG/bitcoin,namecoin/namecoin-core,jambolo/bitcoin,bitcoinknots/bitcoin,fanquake/bitcoin,particl/particl-core,namecoin/namecore,mruddy/bitcoin,fanquake/bitcoin,ajtowns/bitcoin,Xekyo/bitcoin,mruddy/bitcoin,AkioNak/bitcoin,dscotese/bitcoin,GroestlCoin/GroestlCoin,jlopp/statoshi,bitcoin/bitcoin,fujicoin/fujicoin,AkioNak/bitcoin,GroestlCoin/bitcoin,anditto/bitcoin,particl/particl-core,Xekyo/bitcoin,GroestlCoin/bitcoin,bitcoin/bitcoin,mruddy/bitcoin,particl/particl-core,sstone/bitcoin,jamesob/bitcoin,instagibbs/bitcoin,particl/particl-core,jambolo/bitcoin,Xekyo/bitcoin,domob1812/bitcoin,kallewoof/bitcoin,achow101/bitcoin,AkioNak/bitcoin,sstone/bitcoin,andreaskern/bitcoin,domob1812/bitcoin,jlopp/statoshi,Xekyo/bitcoin,jambolo/bitcoin,sstone/bitcoin,Xekyo/bitcoin,achow101/bitcoin,kallewoof/bitcoin,namecoin/namecoin-core,lateminer/bitcoin,fanquake/bitcoin,bitcoinknots/bitcoin,jamesob/bitcoin,sipsorcery/bitcoin,namecoin/namecore,bitcoinsSG/bitcoin,pataquets/namecoin-core,bitcoinsSG/bitcoin,anditto/bitcoin,GroestlCoin/GroestlCoin,pataquets/namecoin-core,lateminer/bitcoin,domob1812/bitcoin,namecoin/namecoin-core,mruddy/bitcoin,bitcoinsSG/bitcoin,instagibbs/bitcoin,instagibbs/bitcoin,GroestlCoin/GroestlCoin,bitcoinsSG/bitcoin,instagibbs/bitcoin,anditto/bitcoin,namecoin/namecoin-core,sipsorcery/bitcoin,namecoin/namecoin-core,namecoin/namecore,jamesob/bitcoin,GroestlCoin/bitcoin,jambolo/bitcoin,dscotese/bitcoin,mruddy/bitcoin,sipsorcery/bitcoin,namecoin/namecore,namecoin/namecoin-core,sipsorcery/bitcoin,particl/particl-core,fanquake/bitcoin,tecnovert/particl-core,tecnovert/particl-core,AkioNak/bitcoin,andreaskern/bitcoin,pataquets/namecoin-core,bitcoin/bitcoin,achow101/bitcoin,sstone/bitcoin,kallewoof/bitcoin,instagibbs/bitcoin,domob1812/bitcoin,particl/particl-core