Update eslint requirement from ^5.11.0 to ^6.0.1

Updates the requirements on [eslint](https://github.com/eslint/eslint) to permit the latest version.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v5.11.0...v6.0.1)

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

package.json

@@ -29,7 +29,7 @@
     "hexo": "^3.1.1",
     "mocha": "^6.0.2",
     "istanbul": "^0.4.2",
-    "eslint": "^5.11.0",
+    "eslint": "^6.0.1",
     "eslint-config-hexo": "^3.0.0"
   },
   "dependencies": {