Minor fix in readme
Minor fix in readme

FAB-2506

Change-Id: I92b6754fc46e652baf5fa7ce3270bcda9c00b9af
Signed-off-by: Jim Zhang <6775950e159d0bc2e58935ca2201ba88526dddf0@us.ibm.com>

ratnakar-asara/fabric-sdk-node,adityachap/fabric-sdk-node,ratnakar-asara/fabric-sdk-node,ratnakar-asara/fabric-sdk-node,adityachap/fabric-sdk-node,ratnakar-asara/fabric-sdk-node