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>

Author: dependabot[bot]

package.json

@@ -92,7 +92,7 @@
     "concurrently": "^2.0.0",
     "crawl": "git://github.com/cesine/crawl.git",
     "enzyme": "^2.3.0",
-    "eslint": "^3.18.0",
+    "eslint": "^4.18.2",
     "eslint-config-standard": "^6.0.0",
     "eslint-config-standard-react": "^4.0.0",
     "eslint-plugin-babel": "^3.2.0",