Bump react-dom from 16.4.1 to 16.4.2 (#140)

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] <support@github.com>

yarn.lock

@@ -4874,8 +4874,9 @@ react-devtools-core@^3.2.2:
     ws "^3.3.1"
 
 react-dom@^16.0.0-beta.5:
-  version "16.4.1"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.4.1.tgz#7f8b0223b3a5fbe205116c56deb85de32685dad6"
+  version "16.4.2"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.4.2.tgz#4afed569689f2c561d2b8da0b819669c38a0bda4"
+  integrity sha512-Usl73nQqzvmJN+89r97zmeUpQDKDlh58eX6Hbs/ERdDHzeBzWy+ENk7fsGQ+5KxArV1iOFPT46/VneklK9zoWw==
   dependencies:
     fbjs "^0.8.16"
     loose-envify "^1.1.0"