chore: upgrade fs-extra => 8.1.0 (#989)

package.json

@@ -23,7 +23,7 @@
     "@types/electron-devtools-installer": "2.0.2",
     "@types/electron-settings": "3.0.0",
     "@types/file-saver": "0.0.1",
-    "@types/fs-extra": "5.0.1",
+    "@types/fs-extra": "8.0.0",
     "@types/jasmine": "3.3.12",
     "@types/jasminewd2": "2.0.3",
     "@types/jquery": "3.3.29",
@@ -54,7 +54,7 @@
     "electron-updater": "2.21.4",
     "exports-loader": "0.6.3",
     "file-loader": "0.10.0",
-    "fs-extra": "5.0.0",
+    "fs-extra": "8.1.0",
     "gh-pages": "2.0.1",
     "html-webpack-plugin": "3.2.0",
     "jasmine": "3.4.0",