chore(deps-dev): bump eslint-config-hexo from 3.0.0 to 4.0.0 (#19)

Bumps [eslint-config-hexo](https://github.com/hexojs/eslint-config-hexo) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/hexojs/eslint-config-hexo/releases)
- [Commits](hexojs/eslint-config-hexo@3.0.0...4.0.0)

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

package.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "chai": "^4.2.0",
     "eslint": "^6.1.0",
-    "eslint-config-hexo": "^3.0.0",
+    "eslint-config-hexo": "^4.0.0",
     "mocha": "^6.0.2",
     "nyc": "^14.1.1"
   },