Upgrading Metro to 0.39.2

Summary: Upgrade to v0.39.2

Reviewed By: rafeca

Differential Revision: D8664421

fbshipit-source-id: 9c71928ab45cb7ef8f882d25cfca1ff0b1687039

package.json

@@ -167,10 +167,10 @@
     "graceful-fs": "^4.1.3",
     "inquirer": "^3.0.6",
     "lodash": "^4.17.5",
-    "metro": "^0.40.0",
-    "metro-babel-register": "^0.40.0",
-    "metro-core": "^0.40.0",
-    "metro-memory-fs": "^0.40.0",
+    "metro": "^0.40.1",
+    "metro-babel-register": "^0.40.1",
+    "metro-core": "^0.40.1",
+    "metro-memory-fs": "^0.40.1",
     "mime": "^1.3.4",
     "minimist": "^1.2.0",
     "mkdirp": "^0.5.1",