Update react-devtools-core to ^3.6.2

Summary:
Update to the latest React DevTools v3 release, which adds the ability to detect when the (v3) frontend is connected with a v4 backend and shows update instructions to the user.

## Changelog:

[General] [Added] - Updated embedded react-devtools-core package to the latest version in preparation for the upcoming v4 DevTools release.

Reviewed By: rickhanlonii

Differential Revision: D16419553

fbshipit-source-id: a36b0ba5bf6992a490f1234b9a92b8abd4c9b3e6

package.json

@@ -105,7 +105,7 @@
     "react": "16.8.6",
     "react-color": "^2.11.7",
     "react-debounce-render": "^4.0.3",
-    "react-devtools-core": "^3.6.1",
+    "react-devtools-core": "^3.6.2",
     "react-dom": "16.8.6",
     "react-emotion": "^9.2.6",
     "react-redux": "^5.0.7",

yarn.lock

@@ -6490,10 +6490,10 @@ react-debounce-render@^4.0.3:
     lodash "^4.17.10"
     lodash.debounce "^4.0.8"
 
-react-devtools-core@^3.6.1:
-  version "3.6.1"
-  resolved "https://registry.yarnpkg.com/react-devtools-core/-/react-devtools-core-3.6.1.tgz#51af81ceada65209bbccb8b547a01187cd1cbf04"
-  integrity sha512-I/LSX+tpeTrGKaF1wXSfJ/kP+6iaP2JfshEjW8LtQBdz6c6HhzOJtjZXhqOUrAdysuey8M1/JgPY1flSVVt8Ig==
+react-devtools-core@^3.6.2:
+  version "3.6.2"
+  resolved "https://registry.yarnpkg.com/react-devtools-core/-/react-devtools-core-3.6.2.tgz#7d425f160c5928129fa9acdbdd9e80a334e09c8d"
+  integrity sha512-a5r2Er0PajtlvKYBUKzB3vW5qek8TbgQWwRruDEwTm3VnqVffHmnvApRil/lfkAa8ghXcESNizrtKu/18oG55Q==
   dependencies:
     shell-quote "^1.6.1"
     ws "^3.3.1"