Update [email protected] in prep for React 16.3

Reviewed By: gaearon

Differential Revision: D6886480

fbshipit-source-id: 09ca9ea8e20bc050ba30ae4e5f73495cace426f5

Author: Brian Vaughn

package.json

@@ -191,7 +191,7 @@
     "promise": "^7.1.1",
     "prop-types": "^15.5.8",
     "react-clone-referenced-element": "^1.0.1",
-    "react-devtools-core": "3.0.0",
+    "react-devtools-core": "3.1.0",
     "react-timer-mixin": "^0.13.2",
     "regenerator-runtime": "^0.11.0",
     "rimraf": "^2.5.4",