v1.9.0

What's Changed

• Add follow-redirect by @floitsch in #30
• Add continuous integration by @floitsch in #31
• Run tests on all platforms by @floitsch in #32
• Change how Toit is downloaded by @floitsch in #33
• Send empty request body when no body is provided by @kasperl in #35
• Don't modify the headers object that is passed in by @floitsch in #37

Full Changelog: v1.8.1...v1.9.0