chore(package): update fs-extra to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -72,7 +72,7 @@
     "eslint-config-prettier": "^2.6.0",
     "eslint-plugin-flowtype": "^2.37.0",
     "flow-bin": "^0.61.0",
-    "fs-extra": "^4.0.2",
+    "fs-extra": "^5.0.0",
     "husky": "^0.14.3",
     "jest": "^21.2.1",
     "json-schema": "0.2.3",