Bump graceful-fs from 4.2.0 to 4.2.1 (#1342)

Bumps [graceful-fs](https://github.com/isaacs/node-graceful-fs) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/isaacs/node-graceful-fs/releases)
- [Commits](https://github.com/isaacs/node-graceful-fs/compare/v4.2.0...v4.2.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -22,7 +22,7 @@
     "electron-rebuild": "^1.8.5",
     "eslint": "^5.16.0",
     "file-loader": "^4.1.0",
-    "graceful-fs": "^4.1.15",
+    "graceful-fs": "^4.2.1",
     "html-loader": "0.5.5",
     "json-loader": "0.5.7",
     "node-abi": "^2.10.0",