chore(deps-dev): bump eslint from 3.19.0 to 4.18.2

Bumps [eslint](https://github.com/eslint/eslint) from 3.19.0 to 4.18.2.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v3.19.0...v4.18.2)

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

package.json

@@ -23,7 +23,7 @@
   "license": "MIT",
   "devDependencies": {
     "chai": "^4.2.0",
-    "eslint": "^3.7.0",
+    "eslint": "^4.18.2",
     "flow-bin": "^0.41.0",
     "mocha": "^6.2.2"
   },