Update builds

manifests/DrumKit.json

@@ -3,8 +3,8 @@
   "author": "Jerry Sievert",
   "license": "BSD-3-Clause",
   "sourceUrl": "https://github.com/JerrySievert/DrumKit",
-  "latestVersion": "0.6.3",
+  "latestVersion": "0.6.4",
   "repoVersion": "0.6.4",
   "status": "available",
-  "buildTimestamp": 1538022383
-}
+  "buildTimestamp": 1540930552
+}