chore(package): update @testing-library/react to version 9.4.0

Closes #59

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "@babel/preset-env": "7.7.6",
     "@babel/preset-react": "7.7.4",
     "@testing-library/jest-dom": "4.2.4",
-    "@testing-library/react": "9.3.2",
+    "@testing-library/react": "9.4.0",
     "autoprefixer": "9.7.3",
     "babel-eslint": "10.0.3",
     "eslint": "6.7.2",