doc: clarify support in SECURITY.md
doc: clarify support in SECURITY.md

vertcoin/vertcoin,ElementsProject/elements,fujicoin/fujicoin,apoelstra/bitcoin,qtumproject/qtum,tecnovert/particl-core,CryptArc/bitcoin,achow101/bitcoin,AkioNak/bitcoin,monacoinproject/monacoin,mruddy/bitcoin,kallewoof/bitcoin,achow101/bitcoin,ahmedbodi/vertcoin,apoelstra/bitcoin,Sjors/bitcoin,jtimon/bitcoin,fanquake/bitcoin,ElementsProject/elements,fujicoin/fujicoin,prusnak/bitcoin,MeshCollider/bitcoin,FeatherCoin/Feathercoin,particl/particl-core,Sjors/bitcoin,mruddy/bitcoin,pstratem/bitcoin,MeshCollider/bitcoin,domob1812/namecore,kallewoof/bitcoin,Xekyo/bitcoin,DigitalPandacoin/pandacoin,namecoin/namecore,achow101/bitcoin,bitcoin/bitcoin,instagibbs/bitcoin,bitcoinsSG/bitcoin,MarcoFalke/bitcoin,jlopp/statoshi,mruddy/bitcoin,jnewbery/bitcoin,yenliangl/bitcoin,ahmedbodi/vertcoin,kallewoof/bitcoin,prusnak/bitcoin,n1bor/bitcoin,nikkitan/bitcoin,andreaskern/bitcoin,alecalve/bitcoin,peercoin/peercoin,dscotese/bitcoin,bitcoinsSG/bitcoin,midnightmagic/bitcoin,vertcoin/vertcoin,GroestlCoin/GroestlCoin,domob1812/namecore,nikkitan/bitcoin,JeremyRubin/bitcoin,JeremyRubin/bitcoin,fujicoin/fujicoin,jambolo/bitcoin,sipsorcery/bitcoin,mruddy/bitcoin,vertcoin/vertcoin,jtimon/bitcoin,jamesob/bitcoin,mitchellcash/bitcoin,domob1812/namecore,AkioNak/bitcoin,gjhiggins/vcoincore,ahmedbodi/vertcoin,GroestlCoin/bitcoin,bitcoin/bitcoin,tecnovert/particl-core,apoelstra/bitcoin,andreaskern/bitcoin,practicalswift/bitcoin,tjps/bitcoin,fujicoin/fujicoin,prusnak/bitcoin,rnicoll/dogecoin,jambolo/bitcoin,monacoinproject/monacoin,dscotese/bitcoin,anditto/bitcoin,fujicoin/fujicoin,bitcoin/bitcoin,qtumproject/qtum,litecoin-project/litecoin,tjps/bitcoin,domob1812/bitcoin,jtimon/bitcoin,JeremyRubin/bitcoin,pstratem/bitcoin,monacoinproject/monacoin,fanquake/bitcoin,yenliangl/bitcoin,practicalswift/bitcoin,apoelstra/bitcoin,AkioNak/bitcoin,pataquets/namecoin-core,vertcoin/vertcoin,GroestlCoin/bitcoin,namecoin/namecoin-core,fanquake/bitcoin,wellenreiter01/Feathercoin,dscotese/bitcoin,FeatherCoin/Feathercoin,prusnak/bitcoin,EthanHeilman/bitcoin,mm-s/bitcoin,mm-s/bitcoin,peercoin/peercoin,jlopp/statoshi,litecoin-project/litecoin,pstratem/bitcoin,AkioNak/bitcoin,ajtowns/bitcoin,andreaskern/bitcoin,bitcoinknots/bitcoin,GroestlCoin/GroestlCoin,gjhiggins/vcoincore,practicalswift/bitcoin,sipsorcery/bitcoin,gjhiggins/vcoincore,n1bor/bitcoin,litecoin-project/litecoin,n1bor/bitcoin,GroestlCoin/GroestlCoin,pataquets/namecoin-core,yenliangl/bitcoin,anditto/bitcoin,mruddy/bitcoin,jamesob/bitcoin,Sjors/bitcoin,fujicoin/fujicoin,bitcoin/bitcoin,rnicoll/bitcoin,EthanHeilman/bitcoin,jtimon/bitcoin,ajtowns/bitcoin,wellenreiter01/Feathercoin,kallewoof/bitcoin,namecoin/namecoin-core,FeatherCoin/Feathercoin,wellenreiter01/Feathercoin,ajtowns/bitcoin,DigitalPandacoin/pandacoin,sipsorcery/bitcoin,yenliangl/bitcoin,MarcoFalke/bitcoin,mm-s/bitcoin,CryptArc/bitcoin,andreaskern/bitcoin,rnicoll/bitcoin,practicalswift/bitcoin,cdecker/bitcoin,midnightmagic/bitcoin,Xekyo/bitcoin,pstratem/bitcoin,rnicoll/bitcoin,MarcoFalke/bitcoin,rnicoll/dogecoin,achow101/bitcoin,particl/particl-core,sstone/bitcoin,mm-s/bitcoin,ElementsProject/elements,FeatherCoin/Feathercoin,instagibbs/bitcoin,GroestlCoin/bitcoin,ahmedbodi/vertcoin,nikkitan/bitcoin,MeshCollider/bitcoin,JeremyRubin/bitcoin,domob1812/bitcoin,DigitalPandacoin/pandacoin,nikkitan/bitcoin,mitchellcash/bitcoin,sipsorcery/bitcoin,instagibbs/bitcoin,namecoin/namecore,qtumproject/qtum,bitcoin/bitcoin,qtumproject/qtum,wellenreiter01/Feathercoin,prusnak/bitcoin,MeshCollider/bitcoin,achow101/bitcoin,tecnovert/particl-core,sstone/bitcoin,FeatherCoin/Feathercoin,jambolo/bitcoin,alecalve/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,jambolo/bitcoin,domob1812/namecore,particl/particl-core,ajtowns/bitcoin,GroestlCoin/bitcoin,lateminer/bitcoin,EthanHeilman/bitcoin,Xekyo/bitcoin,mitchellcash/bitcoin,MarcoFalke/bitcoin,jnewbery/bitcoin,mm-s/bitcoin,ElementsProject/elements,peercoin/peercoin,midnightmagic/bitcoin,instagibbs/bitcoin,practicalswift/bitcoin,Xekyo/bitcoin,qtumproject/qtum,tecnovert/particl-core,domob1812/namecore,jambolo/bitcoin,dscotese/bitcoin,ajtowns/bitcoin,particl/particl-core,qtumproject/qtum,DigitalPandacoin/pandacoin,cdecker/bitcoin,rnicoll/bitcoin,lateminer/bitcoin,pataquets/namecoin-core,bitcoinsSG/bitcoin,bitcoinsSG/bitcoin,namecoin/namecore,rnicoll/bitcoin,rnicoll/dogecoin,fanquake/bitcoin,JeremyRubin/bitcoin,pstratem/bitcoin,CryptArc/bitcoin,domob1812/bitcoin,AkioNak/bitcoin,litecoin-project/litecoin,bitcoinknots/bitcoin,bitcoinsSG/bitcoin,monacoinproject/monacoin,pataquets/namecoin-core,tjps/bitcoin,GroestlCoin/bitcoin,anditto/bitcoin,namecoin/namecoin-core,andreaskern/bitcoin,CryptArc/bitcoin,sipsorcery/bitcoin,peercoin/peercoin,kallewoof/bitcoin,EthanHeilman/bitcoin,lateminer/bitcoin,AkioNak/bitcoin,vertcoin/vertcoin,domob1812/bitcoin,bitcoinknots/bitcoin,cdecker/bitcoin,rnicoll/dogecoin,MarcoFalke/bitcoin,nikkitan/bitcoin,bitcoinknots/bitcoin,mitchellcash/bitcoin,vertcoin/vertcoin,sstone/bitcoin,jnewbery/bitcoin,andreaskern/bitcoin,yenliangl/bitcoin,cdecker/bitcoin,bitcoin/bitcoin,sstone/bitcoin,CryptArc/bitcoin,litecoin-project/litecoin,anditto/bitcoin,sstone/bitcoin,jonasschnelli/bitcoin,namecoin/namecoin-core,domob1812/bitcoin,apoelstra/bitcoin,instagibbs/bitcoin,mitchellcash/bitcoin,DigitalPandacoin/pandacoin,anditto/bitcoin,tecnovert/particl-core,monacoinproject/monacoin,Xekyo/bitcoin,EthanHeilman/bitcoin,rnicoll/bitcoin,gjhiggins/vcoincore,GroestlCoin/GroestlCoin,jtimon/bitcoin,prusnak/bitcoin,Sjors/bitcoin,jamesob/bitcoin,GroestlCoin/bitcoin,mitchellcash/bitcoin,fanquake/bitcoin,particl/particl-core,Xekyo/bitcoin,MeshCollider/bitcoin,peercoin/peercoin,dscotese/bitcoin,jamesob/bitcoin,alecalve/bitcoin,monacoinproject/monacoin,pataquets/namecoin-core,FeatherCoin/Feathercoin,particl/particl-core,GroestlCoin/GroestlCoin,n1bor/bitcoin,practicalswift/bitcoin,pataquets/namecoin-core,ahmedbodi/vertcoin,MeshCollider/bitcoin,jonasschnelli/bitcoin,ElementsProject/elements,midnightmagic/bitcoin,gjhiggins/vcoincore,namecoin/namecore,gjhiggins/vcoincore,apoelstra/bitcoin,jlopp/statoshi,jtimon/bitcoin,kallewoof/bitcoin,lateminer/bitcoin,nikkitan/bitcoin,lateminer/bitcoin,n1bor/bitcoin,tjps/bitcoin,MarcoFalke/bitcoin,domob1812/namecore,dscotese/bitcoin,CryptArc/bitcoin,wellenreiter01/Feathercoin,jnewbery/bitcoin,alecalve/bitcoin,qtumproject/qtum,fanquake/bitcoin,DigitalPandacoin/pandacoin,GroestlCoin/GroestlCoin,cdecker/bitcoin,namecoin/namecore,midnightmagic/bitcoin,litecoin-project/litecoin,JeremyRubin/bitcoin,bitcoinknots/bitcoin,ElementsProject/elements,achow101/bitcoin,namecoin/namecoin-core,EthanHeilman/bitcoin,rnicoll/dogecoin,jonasschnelli/bitcoin,mruddy/bitcoin,jamesob/bitcoin,tjps/bitcoin,cdecker/bitcoin,sstone/bitcoin,alecalve/bitcoin,jlopp/statoshi,bitcoinsSG/bitcoin,wellenreiter01/Feathercoin,jamesob/bitcoin,jlopp/statoshi,jlopp/statoshi,instagibbs/bitcoin,namecoin/namecore,lateminer/bitcoin,mm-s/bitcoin,peercoin/peercoin,ahmedbodi/vertcoin,alecalve/bitcoin,anditto/bitcoin,jonasschnelli/bitcoin,Sjors/bitcoin,tecnovert/particl-core,jnewbery/bitcoin,yenliangl/bitcoin,tjps/bitcoin,midnightmagic/bitcoin,n1bor/bitcoin,domob1812/bitcoin,sipsorcery/bitcoin,jambolo/bitcoin,pstratem/bitcoin,jonasschnelli/bitcoin