Fix output formatting

main.go

@@ -55,7 +55,7 @@ func main() {
 		if len(locs) == 0 {
 			log.Fatal("error: no FIDO2 devices found")
 		}
-		log.Printf("autodetected device: %s %s", locs[0].Manufacturer, locs[0].Product)
+		log.Printf("using %s %s", locs[0].Manufacturer, locs[0].Product)
 		devicePath = locs[0].Path
 	}
 
@@ -104,7 +104,7 @@ func main() {
 	}
 
 	fmt.Printf(
-		"key handle: \"%s\"\npublic key: \"%s\"\n",
+		"key_handle: \"%s\"\npublic_key: \"%s\"\n",
 		base64.StdEncoding.EncodeToString(attest.CredentialID),
 		base64.StdEncoding.EncodeToString(fido2ToCOSE(attest.PubKey)),
 	)