chore(package): update scratch-audio to version 0.1.0-prerelease.20181023202904

Closes #3474

package.json

@@ -97,7 +97,7 @@
     "redux-mock-store": "^1.2.3",
     "redux-throttle": "0.1.1",
     "rimraf": "^2.6.1",
-    "scratch-audio": "0.1.0-prerelease.20180625202813",
+    "scratch-audio": "0.1.0-prerelease.20181023202904",
     "scratch-blocks": "0.1.0-prerelease.1539267627",
     "scratch-l10n": "3.0.20181010220115",
     "scratch-paint": "0.2.0-prerelease.20181017200201",