Bump eslint-config-eslint from 5.0.1 to 6.0.0 in /addon (#34)

Bumps [eslint-config-eslint](https://github.com/eslint/eslint) from 5.0.1 to 6.0.0.
- [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/v5.0.1...v6.0.0)

---
updated-dependencies:
- dependency-name: eslint-config-eslint
  dependency-type: direct:development
...

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

addon/package-lock.json

@@ -870,13 +870,10 @@
       }
     },
     "eslint-config-eslint": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/eslint-config-eslint/-/eslint-config-eslint-5.0.1.tgz",
-      "integrity": "sha512-6TK0/1I/HdlTEU5albfPYs2oXVeYxHFBjIfFc/bNHQ7N+mnLlKmEJVDntSI5/kYoJCEzl1DGd23GIVA5qSkweg==",
-      "dev": true,
-      "requires": {
-        "js-yaml": "^3.5.1"
-      }
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/eslint-config-eslint/-/eslint-config-eslint-6.0.0.tgz",
+      "integrity": "sha512-dZ+eNtuU8V6+SbXgXjUf11/7Bv4EXzIqn4DxA3Ou1YklwFz31veKYTjzF9uYejUQQjOMpLHTEKWMGSmHAoh4wg==",
+      "dev": true
     },
     "eslint-config-google": {
       "version": "0.14.0",

addon/package.json

@@ -31,7 +31,7 @@
   },
   "devDependencies": {
     "eslint": "^6.4.0",
-    "eslint-config-eslint": "^5.0.1",
+    "eslint-config-eslint": "^6.0.0",
     "eslint-config-google": "^0.14.0",
     "eslint-plugin-node": "^10.0.0"
   }