chore(package): update @testing-library/react to version 8.0.4

Closes #89

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
   "devDependencies": {
     "@babel/core": "^7.4.5",
     "@babel/preset-flow": "7.0.0",
-    "@testing-library/react": "8.0.1",
+    "@testing-library/react": "8.0.4",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "10.0.1",
     "babel-jest": "24.8.0",