Update eslint requirement in /{{cookiecutter.app_name}} (#541)

Updates the requirements on [eslint](https://github.com/eslint/eslint) to permit the latest version.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v5.16.0...v6.2.2

)

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

{{cookiecutter.app_name}}/package.json

@@ -38,7 +38,7 @@
     "css-loader": "^3.0.0",
     "eslint-config-airbnb-base": "^14.0.0",
     "eslint-plugin-import": "^2.17.3",
-    "eslint": "^5.16.0",
+    "eslint": "^6.2.2",
     "file-loader": "^4.0.0",
     "less-loader": "^5.0.0",
     "manifest-revision-webpack-plugin": "^0.4.0",