Update jscs requirement from ^2.7.0 to ^3.0.7
Update jscs requirement from ^2.7.0 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] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
hexojs/hexo-generator-archive