Bump eslint from 1.10.3 to 6.5.1

Bumps [eslint](https://github.com/eslint/eslint) from 1.10.3 to 6.5.1.
- [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/v1.10.3...v6.5.1)

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

package.json

@@ -40,7 +40,7 @@
     "chai": "^3.4.1",
     "core-js": "^2.4.1",
     "cross-env": "^3.1.4",
-    "eslint": "^1.10.3",
+    "eslint": "^6.5.1",
     "grunt": "^0.4.5",
     "grunt-cli": "^0.1.13",
     "grunt-contrib-nodeunit": "^0.4.1",