v0.4.0

What's Changed

• Introduce --upgrade CLI argument by @christianhelle in #63
• Change upgrade from option to command in CLI args by @christianhelle in #64
• Add CancellationToken support for SSE streaming endpoints by @christianhelle in #65
• Add header to output file by @christianhelle in #66
• Add support for observing HTTP request/response by @christianhelle in #67

Full Changelog: v0.3.0...v0.4.0