Update chai-as-promised requirement from ^6.0.0 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

@@ -30,7 +30,7 @@
   },
   "devDependencies": {
     "chai": "^3.5.0",
-    "chai-as-promised": "^6.0.0",
+    "chai-as-promised": "^7.1.1",
     "eslint": "^3.11.1",
     "eslint-config-hexo": "^1.0.3",
     "istanbul": "^0.4.5",