Bump http from 0.2.6 to 0.2.8

Bumps [http](https://github.com/hyperium/http) from 0.2.6 to 0.2.8.
- [Release notes](https://github.com/hyperium/http/releases)
- [Changelog](https://github.com/hyperium/http/blob/master/CHANGELOG.md)
- [Commits](hyperium/http@v0.2.6...v0.2.8)

---
updated-dependencies:
- dependency-name: http
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]