Add CHANGELOG Source: https://github.com/reactphp/react/blob/a6de34d61f68adebd3cc3b855268a5f1475749b8/CHANGELOG.md
Add CHANGELOG
Source:
https://github.com/reactphp/react/blob/a6de34d61f68adebd3cc3b855268a5f1475749b8/CHANGELOG.md
reactphp/http-client,zengpuzhang/http-client,arnaud-lb/http-client