Update VM version

package.json

@@ -97,7 +97,7 @@
     "scratch-paint": "0.2.0-prerelease.20180605153807",
     "scratch-render": "0.1.0-prerelease.20180605145739",
     "scratch-storage": "0.5.0",
-    "scratch-vm": "0.1.0-prerelease.1527875455",
+    "scratch-vm": "0.1.0-prerelease.1528291373",
     "scratch-svg-renderer": "0.2.0-prerelease.20180605154326",
     "selenium-webdriver": "3.6.0",
     "startaudiocontext": "1.2.1",