Update scratch vm to include promise reporter fixes

package.json

@@ -102,7 +102,7 @@
     "scratch-render": "0.1.0-prerelease.20180618173030",
     "scratch-storage": "0.5.1",
     "scratch-svg-renderer": "0.2.0-prerelease.20180712223402",
-    "scratch-vm": "0.1.0-prerelease.1531436232",
+    "scratch-vm": "0.1.0-prerelease.1531486395",
     "selenium-webdriver": "3.6.0",
     "startaudiocontext": "1.2.1",
     "style-loader": "^0.21.0",