Bump eslint from 4.18.2 to 5.6.1

Bumps [eslint](https://github.com/eslint/eslint) from 4.18.2 to 5.6.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v4.18.2...v5.6.1)

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

package.json

@@ -31,7 +31,7 @@
     "coveralls": "^3.0.2",
     "data-driven": "^1.4.0",
     "deep-freeze": "^0.0.1",
-    "eslint": "^4.0.0",
+    "eslint": "^5.6.1",
     "istanbul": "^1.1.0-alpha.1",
     "mocha": "^3.4.2",
     "sinon": "^2.3.4"