chore(package): update scratch-vm to version 0.1.0-prerelease.1520372503-prerelease.1520372519

package.json

@@ -94,7 +94,7 @@
     "scratch-paint": "0.2.0-prerelease.20180305152706",
     "scratch-render": "0.1.0-prerelease.1516837442",
     "scratch-storage": "0.4.0",
-    "scratch-vm": "0.1.0-prerelease.1520269961-prerelease.1520269983",
+    "scratch-vm": "0.1.0-prerelease.1520372503-prerelease.1520372519",
     "selenium-webdriver": "3.6.0",
     "startaudiocontext": "1.2.1",
     "style-loader": "^0.20.0",