chore(package): update fs-extra to version 7.0.0

Author: greenkeeper[bot]

Diff for: package.json

@@ -73,7 +73,7 @@
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-flowtype": "^2.41.0",
     "flow-bin": "^0.73.0",
-    "fs-extra": "^6.0.1",
+    "fs-extra": "^7.0.0",
     "husky": "^0.14.3",
     "jest": "^22.1.4",
     "json-schema": "0.2.3",