Update jscs requirement from ^2.9.0 to ^3.0.7

Updates the requirements on [jscs](https://github.com/jscs-dev/node-jscs) to permit the latest version.
- [Release notes](https://github.com/jscs-dev/node-jscs/releases)
- [Changelog](https://github.com/jscs-dev/node-jscs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jscs-dev/node-jscs/commits/v3.0.7)

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

package.json

@@ -27,7 +27,7 @@
     "eslint": "^2.13.1",
     "eslint-config-hexo": "^1.0.2",
     "istanbul": "^0.4.2",
-    "jscs": "^2.9.0",
+    "jscs": "^3.0.7",
     "jscs-preset-hexo": "^1.0.1",
     "mocha": "^5.2.0"
   }