Update eslint-config-airbnb-base requirement from ^11.2.0 to ^13.1.0 in /{{cookiecutter.app_name}}

Updates the requirements on [eslint-config-airbnb-base](https://github.com/airbnb/javascript) to permit the latest version.
- [Release notes](https://github.com/airbnb/javascript/releases)
- [Commits](https://github.com/airbnb/javascript/commits/eslint-config-airbnb-base-v13.1.0)

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

{{cookiecutter.app_name}}/package.json

@@ -33,7 +33,7 @@
     "concurrently": "^4.0.1",
     "css-loader": "^1.0.0",
     "eslint": "^5.3.0",
-    "eslint-config-airbnb-base": "^11.2.0",
+    "eslint-config-airbnb-base": "^13.1.0",
     "eslint-plugin-import": "^2.3.0",
     "extract-text-webpack-plugin": "^2.1.2",
     "file-loader": "^2.0.0",