fix(deps): update dependency eslint-config-prettier to v4 (#74)

Author: renovate[bot]

package-lock.json

@@ -38,7 +38,7 @@
   },
   "dependencies": {
     "babel-eslint": "^9.0.0",
-    "eslint-config-prettier": "^3.6.0",
+    "eslint-config-prettier": "^4.0.0",
     "eslint-plugin-flowtype": "^3.2.1",
     "eslint-plugin-import": "^2.14.0",
     "eslint-plugin-jsx-a11y": "6.1.2",