Bump react-dom from 16.4.1 to 16.4.2

Bumps [react-dom](https://github.com/facebook/react/tree/HEAD/packages/react-dom) from 16.4.1 to 16.4.2.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v16.4.2/packages/react-dom)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/demo/package.json

@@ -5,7 +5,7 @@
   "private": true,
   "dependencies": {
     "react": "^16.4.1",
-    "react-dom": "^16.4.1",
+    "react-dom": "^16.4.2",
     "react-scripts": "1.1.4"
   },
   "scripts": {

yarn.lock

@@ -6259,9 +6259,9 @@ react-dev-utils@^5.0.1:
     strip-ansi "3.0.1"
     text-table "0.2.0"
 
-react-dom@^16.4.1:
-  version "16.4.1"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.4.1.tgz#7f8b0223b3a5fbe205116c56deb85de32685dad6"
+react-dom@^16.4.2:
+  version "16.4.2"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.4.2.tgz#4afed569689f2c561d2b8da0b819669c38a0bda4"
   dependencies:
     fbjs "^0.8.16"
     loose-envify "^1.1.0"