add missing @hook in exch plugin
add missing @hook in exch plugin

vertcoin/electrum-vtc,cryptapus/electrum-myr,wakiyamap/electrum-mona,kyuupichan/electrum,neocogent/electrum,dashpay/electrum-dash,pooler/electrum-ltc,pknight007/electrum-vtc,wakiyamap/electrum-mona,argentumproject/electrum-arg,wakiyamap/electrum-mona,procrasti/electrum,fyookball/electrum,pooler/electrum-ltc,fyookball/electrum,neocogent/electrum,vertcoin/electrum-vtc,imrehg/electrum,fujicoin/electrum-fjc,fyookball/electrum,asfin/electrum,FairCoinTeam/electrum-fair,cryptapus/electrum-uno,digitalbitbox/electrum,argentumproject/electrum-arg,digitalbitbox/electrum,pooler/electrum-ltc,procrasti/electrum,fireduck64/electrum,cryptapus/electrum-uno,asfin/electrum,FairCoinTeam/electrum-fair,dabura667/electrum,neocogent/electrum,asfin/electrum,pknight007/electrum-vtc,kyuupichan/electrum,pooler/electrum-ltc,aasiutin/electrum,aasiutin/electrum,fireduck64/electrum,vertcoin/electrum-vtc,lbryio/lbryum,vertcoin/electrum-vtc,fujicoin/electrum-fjc,pknight007/electrum-vtc,romanz/electrum,kyuupichan/electrum,vialectrum/vialectrum,molecular/electrum,protonn/Electrum-Cash,digitalbitbox/electrum,FairCoinTeam/electrum-fair,dabura667/electrum,protonn/Electrum-Cash,cryptapus/electrum-myr,dashpay/electrum-dash,spesmilo/electrum,fireduck64/electrum,argentumproject/electrum-arg,dashpay/electrum-dash,vialectrum/vialectrum,aasiutin/electrum,cryptapus/electrum-uno,dabura667/electrum,romanz/electrum,procrasti/electrum,imrehg/electrum,cryptapus/electrum,imrehg/electrum,wakiyamap/electrum-mona,romanz/electrum,fireduck64/electrum,molecular/electrum,pknight007/electrum-vtc,cryptapus/electrum,digitalbitbox/electrum,procrasti/electrum,cryptapus/electrum,protonn/Electrum-Cash,dabura667/electrum,argentumproject/electrum-arg,vialectrum/vialectrum,cryptapus/electrum-uno,aasiutin/electrum,dashpay/electrum-dash,spesmilo/electrum,molecular/electrum,fujicoin/electrum-fjc,spesmilo/electrum,cryptapus/electrum-myr,FairCoinTeam/electrum-fair,protonn/Electrum-Cash,lbryio/lbryum,imrehg/electrum,molecular/electrum,cryptapus/electrum-myr,spesmilo/electrum