cmd/lncli: add version command that reads verrpc.GetVersion

cmd/lncli/main.go

@@ -301,6 +301,7 @@ func main() {
 		restoreChanBackupCommand,
 		bakeMacaroonCommand,
 		trackPaymentCommand,
+		versionCommand,
 	}
 
 	// Add any extra commands determined by build flags.