Updating Retrofit client to address Github security warning.
Updating Retrofit client to address Github security warning.

DwayneJengSage/BridgeJavaSDK,Sage-Bionetworks/BridgeJavaSDK,alxdarksage/BridgeJavaSDK,alxdarksage/BridgeJavaSDK,DwayneJengSage/BridgeJavaSDK,Sage-Bionetworks/BridgeJavaSDK