Bump eslint from 2.13.1 to 4.18.2

Bumps [eslint](https://github.com/eslint/eslint) from 2.13.1 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@v2.13.1...v4.18.2)

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

package.json

@@ -31,7 +31,7 @@
     "babel-core": "^7.0.0-0",
     "babel-preset-umi": "^1.0.0",
     "coveralls": "^3.0.6",
-    "eslint": "^2.7.0",
+    "eslint": "^4.18.2",
     "eslint-config-airbnb": "^6.2.0",
     "material-ui": "^0.20.2",
     "np": "^5.0.3",