Bump eslint from 3.19.0 to 6.8.0

Bumps [eslint](https://github.com/eslint/eslint) from 3.19.0 to 6.8.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v3.19.0...v6.8.0)

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

package.json

@@ -23,7 +23,7 @@
   "homepage": "https://github.com/yanm1ng/hexo-theme-vexo",
   "devDependencies": {
     "ejs-lint": "^0.2.0",
-    "eslint": "^3.14.0",
+    "eslint": "^6.8.0",
     "eslint-plugin-import": "^2.2.0",
     "standard": "^10.0.2"
   },