Bump Metro to 0.43.0

Summary: Bump to new version because of breaking configuration changes in metro

Reviewed By: hramos, rafeca

Differential Revision: D8989698

fbshipit-source-id: 6f397004f4a87075909ee47b1950a3fe32c1caff

Author: Ives van Hoorne

package.json

@@ -167,10 +167,10 @@
     "graceful-fs": "^4.1.3",
     "inquirer": "^3.0.6",
     "lodash": "^4.17.5",
-    "metro": "^0.42.2",
-    "metro-babel-register": "^0.42.2",
-    "metro-core": "^0.42.2",
-    "metro-memory-fs": "^0.42.2",
+    "metro": "^0.43.0",
+    "metro-babel-register": "^0.43.0",
+    "metro-core": "^0.43.0",
+    "metro-memory-fs": "^0.43.0",
     "mime": "^1.3.4",
     "minimist": "^1.2.0",
     "mkdirp": "^0.5.1",