test: use f-strings in feature_fee_estimation.py
test: use f-strings in feature_fee_estimation.py

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