Bump eslint from 4.19.1 to 6.8.0

Bumps [eslint](https://github.com/eslint/eslint) from 4.19.1 to 6.8.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v4.19.1...v6.8.0)

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

package.json

@@ -11,7 +11,7 @@
     "chai": "^4.2.0",
     "clear-module": "^2.1.0",
     "coveralls": "^3.0.3",
-    "eslint": "^4.19.1",
+    "eslint": "^6.8.0",
     "eslint-config-standard": "^10.2.1",
     "eslint-plugin-import": "^2.16.0",
     "eslint-plugin-node": "^5.2.1",