chore(package): update scratch-blocks to version 0.1.0-prerelease.1540579760

Closes #3518

package.json

@@ -99,7 +99,7 @@
     "redux-throttle": "0.1.1",
     "rimraf": "^2.6.1",
     "scratch-audio": "0.1.0-prerelease.20181023202904",
-    "scratch-blocks": "0.1.0-prerelease.1540417094",
+    "scratch-blocks": "0.1.0-prerelease.1540579760",
     "scratch-l10n": "3.0.20181024221158",
     "scratch-paint": "0.2.0-prerelease.20181024214759",
     "scratch-render": "0.1.0-prerelease.20181024220305",