Bump eslint-config-prettier from 6.2.0 to 6.4.0

Bumps [eslint-config-prettier](https://github.com/prettier/eslint-config-prettier) from 6.2.0 to 6.4.0.
- [Release notes](https://github.com/prettier/eslint-config-prettier/releases)
- [Changelog](https://github.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/eslint-config-prettier@v6.2.0...v6.4.0)

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

package.json

@@ -75,7 +75,7 @@
     "chokidar-cli": "^2.0.0",
     "dotenv": "^8.1.0",
     "eslint": "^6.5.1",
-    "eslint-config-prettier": "^6.2.0",
+    "eslint-config-prettier": "^6.4.0",
     "eslint-plugin-prettier": "^3.1.1",
     "eslint-plugin-react": "^7.16.0",
     "optipng-bin": "^6.0.0",