Update prettier requirement from ^2.3.2 to ^2.4.0 (#88)

Updates the requirements on [prettier](https://github.com/prettier/prettier) to permit the latest version.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](prettier/prettier@2.3.2...2.4.0)

---
updated-dependencies:
- dependency-name: prettier
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -30,6 +30,6 @@
     "eslint-plugin-import": "^2.24.2",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^5.1.0",
-    "prettier": "^2.3.2"
+    "prettier": "^2.4.0"
   }
 }