Implement toString for UpdateSignature
Implement toString for UpdateSignature

ianngiaw/HubTurbo,saav/HubTurbo,saav/HubTurbo,HyungJon/HubTurbo,gaieepo/HubTurbo,ianngiaw/HubTurbo,gaieepo/HubTurbo,Honoo/HubTurbo,HyungJon/HubTurbo,Sumei1009/HubTurbo,Honoo/HubTurbo,Sumei1009/HubTurbo