doc: Add historical release notes for 0.18.0
doc: Add historical release notes for 0.18.0

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Sjors/bitcoin,namecoin/namecoin-core,mm-s/bitcoin,Xekyo/bitcoin,litecoin-project/litecoin,ElementsProject/elements,sipsorcery/bitcoin,sstone/bitcoin,pataquets/namecoin-core,monacoinproject/monacoin,mitchellcash/bitcoin,bitcoinknots/bitcoin,jnewbery/bitcoin,bitcoinknots/bitcoin,GroestlCoin/GroestlCoin,wellenreiter01/Feathercoin,jlopp/statoshi,gjhiggins/vcoincore,andreaskern/bitcoin,practicalswift/bitcoin,nikkitan/bitcoin,domob1812/namecore,practicalswift/bitcoin,jlopp/statoshi,jambolo/bitcoin,nikkitan/bitcoin,domob1812/bitcoin,midnightmagic/bitcoin,CryptArc/bitcoin,jtimon/bitcoin,fanquake/bitcoin,lateminer/bitcoin,fanquake/bitcoin,namecoin/namecoin-core,bitcoinsSG/bitcoin,jamesob/bitcoin,tjps/bitcoin,jamesob/bitcoin,MarcoFalke/bitcoin,n1bor/bitcoin,lateminer/bitcoin,litecoin-project/litecoin,prusnak/bitcoin,pataquets/namecoin-core,domob1812/namecore,jambolo/bitcoin,JeremyRubin/bitcoin,jambolo/bitcoin,dscotese/bitcoin,MeshCollider/bitcoin,instagibbs/bitcoin,pataquets/namecoin-core,rnicoll/dogecoin,kallewoof/bitcoin,tjps/bitcoin,fanquake/bitcoin,rnicoll/bitcoin,sipsorcery/bitcoin,apoelstra/bitcoin,MarcoFalke/bitcoin,yenliangl/bitcoin,namecoin/namecore,achow101/bitcoin,bitcoin/bitcoin,jtimon/bitcoin,namecoin/namecore,instagibbs/bitcoin,dscotese/bitcoin,pstratem/bitcoin,tecnovert/particl-core,AkioNak/bitcoin,n1bor/bitcoin,GroestlCoin/bitcoin,AkioNak/bitcoin,GroestlCoin/GroestlCoin,prusnak/bitcoin,namecoin/namecore,MeshCollider/bitcoin,sipsorcery/bitcoin,ahmedbodi/vertcoin,bitcoinsSG/bitcoin,mruddy/bitcoin,domob1812/bitcoin,rnicoll/bitcoin,practicalswift/bitcoin,MeshCollider/bitcoin,afk11/bitcoin,pstratem/bitcoin,qtumproject/qtum,peercoin/peercoin,fujicoin/fujicoin,dscotese/bitcoin,fujicoin/fujicoin,sstone/bitcoin,namecoin/namecoin-core,bitcoin/bitcoin,mitchellcash/bitcoin,achow101/bitcoin,jlopp/statoshi,JeremyRubin/bitcoin,sstone/bitcoin,Xekyo/bitcoin,CryptArc/bitcoin,fujicoin/fujicoin,ahmedbodi/vertcoin,peercoin/peercoin,Xekyo/bitcoin,gjhiggins/vcoincore,fujicoin/fujicoin,achow101/bitcoin,domob1812/namecore,qtumproject/qtum,ahmedbodi/vertcoin,ajtowns/bitcoin,prusnak/bitcoin,GroestlCoin/bitcoin,jonasschnelli/bitcoin,jlopp/statoshi,mm-s/bitcoin,sstone/bitcoin,rnicoll/bitcoin,andreaskern/bitcoin,namecoin/namecoin-core,gjhiggins/vcoincore,JeremyRubin/bitcoin,monacoinproject/monacoin,instagibbs/bitcoin,bitcoinsSG/bitcoin,mm-s/bitcoin,GroestlCoin/bitcoin,domob1812/bitcoin,n1bor/bitcoin,yenliangl/bitcoin,cdecker/bitcoin,alecalve/bitcoin,DigitalPandacoin/pandacoin,jonasschnelli/bitcoin,mruddy/bitcoin,tecnovert/particl-core,mruddy/bitcoin,jlopp/statoshi,bitcoin/bitcoin,jambolo/bitcoin,CryptArc/bitcoin,anditto/bitcoin,mruddy/bitcoin,rnicoll/dogecoin,EthanHeilman/bitcoin,jambolo/bitcoin,MeshCollider/bitcoin,achow101/bitcoin,peercoin/peercoin,afk11/bitcoin,alecalve/bitcoin,DigitalPandacoin/pandacoin,mruddy/bitcoin,jonasschnelli/bitcoin,namecoin/namecoin-core,ahmedbodi/vertcoin,EthanHeilman/bitcoin,cdecker/bitcoin,wellenreiter01/Feathercoin,DigitalPandacoin/pandacoin,jnewbery/bitcoin,litecoin-project/litecoin,ajtowns/bitcoin,FeatherCoin/Feathercoin,MarcoFalke/bitcoin,ahmedbodi/vertcoin,Sjors/bitcoin,alecalve/bitcoin,cdecker/bitcoin,pataquets/namecoin-core,n1bor/bitcoin,tjps/bitcoin,sipsorcery/bitcoin,qtumproject/qtum,apoelstra/bitcoin,rnicoll/bitcoin,jamesob/bitcoin,bitcoin/bitcoin,qtumproject/qtum,gjhiggins/vcoincore,EthanHeilman/bitcoin,mitchellcash/bitcoin,AkioNak/bitcoin,FeatherCoin/Feathercoin,alecalve/bitcoin,Xekyo/bitcoin,alecalve/bitcoin,jambolo/bitcoin,lateminer/bitcoin,nikkitan/bitcoin,apoelstra/bitcoin,mitchellcash/bitcoin,instagibbs/bitcoin,Sjors/bitcoin,EthanHeilman/bitcoin,dscotese/bitcoin,particl/particl-core,lateminer/bitcoin,Xekyo/bitcoin,vertcoin/vertcoin,jamesob/bitcoin,andreaskern/bitcoin,afk11/bitcoin,pstratem/bitcoin,alecalve/bitcoin,sstone/bitcoin,AkioNak/bitcoin,vertcoin/vertcoin,domob1812/namecore,mitchellcash/bitcoin,Sjors/bitcoin,bitcoinsSG/bitcoin,litecoin-project/litecoin,namecoin/namecore,domob1812/bitcoin,afk11/bitcoin,monacoinproject/monacoin,ajtowns/bitcoin,tjps/bitcoin,kallewoof/bitcoin,FeatherCoin/Feathercoin,practicalswift/bitcoin,rnicoll/dogecoin,vertcoin/vertcoin,rnicoll/bitcoin,CryptArc/bitcoin,jnewbery/bitcoin,MarcoFalke/bitcoin,yenliangl/bitcoin,prusnak/bitcoin,DigitalPandacoin/pandacoin,MeshCollider/bitcoin,midnightmagic/bitcoin,monacoinproject/monacoin,tecnovert/particl-core,afk11/bitcoin,domob1812/namecore,bitcoin/bitcoin,apoelstra/bitcoin,cdecker/bitcoin,pataquets/namecoin-core,jtimon/bitcoin,wellenreiter01/Feathercoin,particl/particl-core,jamesob/bitcoin,MeshCollider/bitcoin,wellenreiter01/Feathercoin,CryptArc/bitcoin,qtumproject/qtum,midnightmagic/bitcoin,gjhiggins/vcoincore,midnightmagic/bitcoin,namecoin/namecore,apoelstra/bitcoin,CryptArc/bitcoin,GroestlCoin/bitcoin,litecoin-project/litecoin,fanquake/bitcoin,yenliangl/bitcoin,practicalswift/bitcoin,wellenreiter01/Feathercoin,vertcoin/vertcoin,jonasschnelli/bitcoin,jlopp/statoshi,particl/particl-core,tjps/bitcoin,prusnak/bitcoin,tjps/bitcoin,GroestlCoin/GroestlCoin,AkioNak/bitcoin,tecnovert/particl-core,vertcoin/vertcoin,EthanHeilman/bitcoin,dscotese/bitcoin,midnightmagic/bitcoin,n1bor/bitcoin,namecoin/namecoin-core,bitcoinknots/bitcoin,rnicoll/dogecoin,fanquake/bitcoin,GroestlCoin/bitcoin,namecoin/namecore,ElementsProject/elements,ElementsProject/elements,jtimon/bitcoin,kallewoof/bitcoin,particl/particl-core,yenliangl/bitcoin,vertcoin/vertcoin,jonasschnelli/bitcoin,peercoin/peercoin,bitcoinknots/bitcoin,MarcoFalke/bitcoin,achow101/bitcoin,FeatherCoin/Feathercoin,ajtowns/bitcoin,anditto/bitcoin,ElementsProject/elements,monacoinproject/monacoin,pstratem/bitcoin,apoelstra/bitcoin,fanquake/bitcoin,GroestlCoin/bitcoin,sipsorcery/bitcoin,gjhiggins/vcoincore,jtimon/bitcoin,pstratem/bitcoin,sstone/bitcoin,nikkitan/bitcoin,DigitalPandacoin/pandacoin,mm-s/bitcoin,nikkitan/bitcoin,particl/particl-core,lateminer/bitcoin,kallewoof/bitcoin,GroestlCoin/GroestlCoin,bitcoin/bitcoin,dscotese/bitcoin,cdecker/bitcoin,jtimon/bitcoin,cdecker/bitcoin,ahmedbodi/vertcoin,qtumproject/qtum,tecnovert/particl-core,mm-s/bitcoin,GroestlCoin/GroestlCoin,lateminer/bitcoin,Sjors/bitcoin,anditto/bitcoin,midnightmagic/bitcoin,rnicoll/bitcoin,nikkitan/bitcoin,bitcoinknots/bitcoin,practicalswift/bitcoin,prusnak/bitcoin,rnicoll/dogecoin,andreaskern/bitcoin,wellenreiter01/Feathercoin,EthanHeilman/bitcoin,bitcoinsSG/bitcoin,fujicoin/fujicoin,JeremyRubin/bitcoin,qtumproject/qtum,pataquets/namecoin-core,monacoinproject/monacoin,jnewbery/bitcoin,mruddy/bitcoin,ElementsProject/elements,DigitalPandacoin/pandacoin,particl/particl-core,peercoin/peercoin,tecnovert/particl-core,afk11/bitcoin,FeatherCoin/Feathercoin,anditto/bitcoin,JeremyRubin/bitcoin,jamesob/bitcoin,andreaskern/bitcoin,MarcoFalke/bitcoin,ElementsProject/elements,GroestlCoin/GroestlCoin,ajtowns/bitcoin,FeatherCoin/Feathercoin,n1bor/bitcoin,sipsorcery/bitcoin,Xekyo/bitcoin,peercoin/peercoin,anditto/bitcoin,mitchellcash/bitcoin,litecoin-project/litecoin,domob1812/bitcoin,fujicoin/fujicoin,bitcoinsSG/bitcoin,instagibbs/bitcoin,andreaskern/bitcoin,achow101/bitcoin,pstratem/bitcoin,kallewoof/bitcoin,instagibbs/bitcoin,mm-s/bitcoin,anditto/bitcoin,AkioNak/bitcoin,domob1812/bitcoin,ajtowns/bitcoin,jnewbery/bitcoin,domob1812/namecore,JeremyRubin/bitcoin,yenliangl/bitcoin,kallewoof/bitcoin