hprox-0.4.0: Changelog.md

## 0.4.0

- naiveproxy compatible [padding](https://github.com/klzgrad/naiveproxy/#padding-protocol-an-informal-specification) support (`--naive`)
- strong TLS settings as advised by [SSL Labs ssltest](https://www.ssllabs.com/ssltest)

## 0.3.0

- initial version with exposed library interface