Update chai-as-promised requirement from ^5.3.0 to ^7.1.1

Updates the requirements on [chai-as-promised](https://github.com/domenic/chai-as-promised) to permit the latest version.
- [Release notes](https://github.com/domenic/chai-as-promised/releases)
- [Commits](https://github.com/domenic/chai-as-promised/commits/v7.1.1)

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

package.json

@@ -44,7 +44,7 @@
   },
   "devDependencies": {
     "chai": "^3.5.0",
-    "chai-as-promised": "^5.3.0",
+    "chai-as-promised": "^7.1.1",
     "eslint": "^4.19.1",
     "eslint-config-hexo": "^3.0.0",
     "hexo-renderer-marked": "^0.2.10",