Update builds

manifests/AudibleInstrumentsPreview.json

@@ -8,7 +8,7 @@
   "manualUrl": "https://vcvrack.com/AudibleInstruments.html#preview",
   "repoVersion": "0.6.4",
   "productId": "1288416624683",
-  "buildTimestamp": 1536784696,
+  "buildTimestamp": 1539074149,
   "status": "available",
-  "latestVersion": "0.6.3"
+  "latestVersion": "0.6.4"
 }