Fix React Native AsyncMode and DevTools

Summary:
Fixes two problems I uncovered with React Native:
1. `FBCore/Prelude` points to `React.unstable_AsyncMode` which is not defined. (This type was renamed to `React.unstable_ConcurrentMode` in React v16.6.0. **As a result** people in the "react_native:async_rendering" GK will no longer get runtime errors on app start.
2. Updates `react-devtools` and (more importantly) `react-devtools-core` to 3.4.2 to handle the React-internal tag/type refactoring that happened prior to the release of 16.6.0. **As a result** DevTools will no longer cause a runtime error when connected to React Native.

For the second change, I ran `js1 upgrade react-devtools -v ^3.4.2`

Reviewed By: sebmarkbage

Differential Revision: D13030590

fbshipit-source-id: 603f7f6259f282839039820bcdba4310064a7965

Libraries/ReactNative/renderApplication.js

@@ -49,8 +49,8 @@ function renderApplication<Props: Object>(
     RootComponent.prototype.unstable_isAsyncReactComponent === true
   ) {
     // $FlowFixMe This is not yet part of the official public API
-    const AsyncMode = React.unstable_AsyncMode;
-    renderable = <AsyncMode>{renderable}</AsyncMode>;
+    const ConcurrentMode = React.unstable_ConcurrentMode;
+    renderable = <ConcurrentMode>{renderable}</ConcurrentMode>;
   }
 
   if (fabric) {

package.json

@@ -192,7 +192,7 @@
     "promise": "^7.1.1",
     "prop-types": "^15.5.8",
     "react-clone-referenced-element": "^1.0.1",
-    "react-devtools-core": "^3.4.0",
+    "react-devtools-core": "^3.4.2",
     "regenerator-runtime": "^0.11.0",
     "rimraf": "^2.5.4",
     "semver": "^5.0.3",

yarn.lock

@@ -5391,10 +5391,10 @@ react-deep-force-update@^1.0.0:
   resolved "https://registry.yarnpkg.com/react-deep-force-update/-/react-deep-force-update-1.1.2.tgz#3d2ae45c2c9040cbb1772be52f8ea1ade6ca2ee1"
   integrity sha512-WUSQJ4P/wWcusaH+zZmbECOk7H5N2pOIl0vzheeornkIMhu+qrNdGFm0bDZLCb0hSF0jf/kH1SgkNGfBdTc4wA==
 
-react-devtools-core@^3.4.0:
-  version "3.4.0"
-  resolved "https://registry.yarnpkg.com/react-devtools-core/-/react-devtools-core-3.4.0.tgz#6b61594dce01b129a9e0b44b5bc4952f8f59ceec"
-  integrity sha512-yV3LLhoRwbfcQyVPNwb1EZ9W7CGu+kX2EqyZ3Cl5C+cbXcb6FJ3YSeeBt9BQB+hjyjRMBjQSKqnpPS6OMSEUow==
+react-devtools-core@^3.4.2:
+  version "3.4.2"
+  resolved "https://registry.yarnpkg.com/react-devtools-core/-/react-devtools-core-3.4.2.tgz#4888b428f1db9a3078fdff66a1da14f71fb1680e"
+  integrity sha512-1pqbxenMeOiVPLf5Fm69woc+Q/pb/lLfWCizJuVJQDm9v7x0fcr76VMcq6Q30Onv3ikkfrlAQgOcOdCk/0t5tA==
   dependencies:
     shell-quote "^1.6.1"
     ws "^3.3.1"