Downgrade fs-extra for v7.x release branch

Author: craigtaub

package-lock.json

@@ -99,7 +99,7 @@
     "eslint-plugin-prettier": "^3.1.2",
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-standard": "^4.0.1",
-    "fs-extra": "^9.0.0",
+    "fs-extra": "^8.0.1",
     "husky": "^4.2.3",
     "hyperlink": "^4.4.3",
     "image-size": "^0.8.3",