Correct git command in README.md
Correct git command in README.md

sasikumarGoli/learn-chaincode,Earlvik/learn-chaincode,manchunw/learn-chaincode,Akasalabs/Plilot1,shivam3192/learn-chaincode,twitsakthi/learn-chaincode,MrRamers/learn-chaincode,cbagade/healthcare_chain_code,cweiers/learn-chaincode,haribalaji79/learn-chaincode,everimbaq/learn-chaincode,JonathanGonczoroski/learn-chaincode,adilharis2001/learn-chaincode,anilder89/learn-chaincode,naveensharma99/learn-chaincode,mshingote/learn-chaincode,fabianromeroq/learn-chaincode,hiroaki-nakamura/learn-chaincode,abhishekibm/learn-chaincode,Earlvik/learn-chaincode,Akasalabs/Plilot1,Earlvik/learn-chaincode,aakaakar/learn-chaincode,apthomas/learn-chaincode,aakaakar/ranjan_chaincode7