Upgrade React developer tools to 2.3.0

Reviewed By: spicyj

Differential Revision: D5175272

fbshipit-source-id: f5184b7c66d71bd6dcc5dcf3a9734b445af1c0a9

package.json

@@ -196,7 +196,7 @@
     "promise": "^7.1.1",
     "prop-types": "^15.5.8",
     "react-clone-referenced-element": "^1.0.1",
-    "react-devtools-core": "^2.2.1",
+    "react-devtools-core": "^2.3.0",
     "react-timer-mixin": "^0.13.2",
     "react-transform-hmr": "^1.0.4",
     "rebound": "^0.0.13",