chore(deps-dev): bump eslint from 6.8.0 to 7.3.1 (#31)

Bumps [eslint](https://github.com/eslint/eslint) from 6.8.0 to 7.3.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v6.8.0...v7.3.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -29,7 +29,7 @@
   },
   "devDependencies": {
     "chai": "^4.2.0",
-    "eslint": "^6.1.0",
+    "eslint": "^7.3.1",
     "eslint-config-hexo": "^4.0.0",
     "mocha": "^8.0.1",
     "nyc": "^15.0.0"