Update scratch-vm.

package.json

@@ -100,7 +100,7 @@
     "scratch-render": "0.1.0-prerelease.20180613192740",
     "scratch-storage": "0.5.1",
     "scratch-svg-renderer": "0.2.0-prerelease.20180613184320",
-    "scratch-vm": "0.1.0-prerelease.1528920435",
+    "scratch-vm": "0.1.0-prerelease.1529017807",
     "selenium-webdriver": "3.6.0",
     "startaudiocontext": "1.2.1",
     "style-loader": "^0.21.0",