Bump eslint from 2.13.1 to 6.8.0

Bumps [eslint](https://github.com/eslint/eslint) from 2.13.1 to 6.8.0.
- [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/v2.13.1...v6.8.0)

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

package.json

@@ -24,7 +24,7 @@
     "uglify-js": "^2.7.5"
   },
   "devDependencies": {
-    "eslint": "^2.2.0",
+    "eslint": "^6.8.0",
     "eslint-plugin-json": "^1.1.0",
     "jasmine-node": "^1.14.5"
   }