Update eslint-config-prettier requirement from ^5.0.0 to ^6.0.0

Updates the requirements on [eslint-config-prettier](https://github.com/prettier/eslint-config-prettier) to permit the latest version.
- [Release notes](https://github.com/prettier/eslint-config-prettier/releases)
- [Changelog](https://github.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prettier/eslint-config-prettier/compare/v5.0.0...v6.0.0)

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

package.json

@@ -45,7 +45,7 @@
     "del": "^4.1.1",
     "eslint": "^5.16.0",
     "eslint-config-airbnb-base": "^13.1.0",
-    "eslint-config-prettier": "^5.0.0",
+    "eslint-config-prettier": "^6.0.0",
     "eslint-plugin-import": "^2.17.3",
     "glob": "^7.1.4",
     "inquirer": "^6.3.1",