Update react/http to v1

This package needs update to react/http v1 and have a new major release tag.

Check list for that:

1. Update the dependency
2. Update the code based on migration guide: https://github.com/reactphp/http/releases/tag/v1.0.0
3. Make sure tests don't fail, not that this project hasn't been update in a while so if some jobs or Travis fail that is fine
4. Create PR