updated README.md (1.4.0)
updated README.md (1.4.0)

habibmasuro/explorer,xCoreDev/explorer,upgradeadvice/explorer,jemekite/fedoracoin-iquidus,fsb4000/explorer,suprnurd/ciquidus,CryptArc/explorer,upgradeadvice/explorer,CryptArc/explorer,UdjinM6/Coin2.1-explorer,UdjinM6/C2Chain,iquidus/explorer,fsb4000/explorer,suprnurd/ciquidus,Findblocks/Blockexplorer,suprnurd/ciquidus,rudy4682/explorer,habibmasuro/explorer,jemekite/fedoracoin-iquidus,rudy4682/blockexp.info,UdjinM6/C2Chain,mmitech/explorer,UdjinM6/Coin2.1-explorer,mmitech/explorer,rudy4682/explorer,Findblocks/Blockexplorer,rudy4682/blockexp.info,xCoreDev/explorer