Update dependency @testing-library/jest-dom to v5.11.8

Author: renovate-bot

package.json

@@ -8,7 +8,7 @@
     "@babel/core": "7.4.5",
     "@babel/preset-env": "7.4.5",
     "@babel/preset-react": "7.0.0",
-    "@testing-library/jest-dom": "5.1.1",
+    "@testing-library/jest-dom": "5.11.8",
     "@testing-library/react": "9.4.1",
     "babel-loader": "8.0.6",
     "css-loader": "3.4.2",