Update supertest requirement from ^1.2.0 to ^3.4.2
Update supertest requirement from ^1.2.0 to ^3.4.2

Updates the requirements on [supertest](https://github.com/visionmedia/supertest) to permit the latest version.
- [Release notes](https://github.com/visionmedia/supertest/releases)
- [Changelog](https://github.com/visionmedia/supertest/blob/master/History.md)
- [Commits](https://github.com/visionmedia/supertest/compare/v1.2.0...v3.4.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
hodavidhara/koa-rest-cache