Bump react-app-rewired from 2.1.6 to 2.1.8

Bumps [react-app-rewired](https://github.com/timarney/react-app-rewired) from 2.1.6 to 2.1.8.
- [Release notes](https://github.com/timarney/react-app-rewired/releases)
- [Commits](timarney/react-app-rewired@2.1.6...2.1.8)

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

Author: dependabot-preview[bot]

package.json

@@ -43,7 +43,7 @@
     "pretty": "^2.0.0",
     "raven-js": "^3.27.2",
     "react": "^16.14.0",
-    "react-app-rewired": "^2.1.6",
+    "react-app-rewired": "^2.1.8",
     "react-dom": "^16.13.1",
     "react-router-dom": "^5.2.0",
     "react-scripts": "3.4.3",

yarn.lock

@@ -9941,10 +9941,10 @@ react-app-polyfill@^1.0.6:
     regenerator-runtime "^0.13.3"
     whatwg-fetch "^3.0.0"
 
-react-app-rewired@^2.1.6:
-  version "2.1.6"
-  resolved "https://registry.yarnpkg.com/react-app-rewired/-/react-app-rewired-2.1.6.tgz#33ee3076a7f34d6a7c94e649cac67e7c8c580de8"
-  integrity sha512-06flj0kK5tf/RN4naRv/sn6j3sQd7rsURoRLKLpffXDzJeNiAaTNic+0I8Basojy5WDwREkTqrMLewSAjcb13w==
+react-app-rewired@^2.1.8:
+  version "2.1.8"
+  resolved "https://registry.yarnpkg.com/react-app-rewired/-/react-app-rewired-2.1.8.tgz#e192f93b98daf96889418d33d3e86cf863812b56"
+  integrity sha512-wjXPdKPLscA7mn0I1de1NHrbfWdXz4S1ladaGgHVKdn1hTgKK5N6EdGIJM0KrS6bKnJBj7WuqJroDTsPKKr66Q==
   dependencies:
     semver "^5.6.0"