Update Changelog with env output item (#429)

## Type of change

<!-- (mark with an `X`) -->

```
- [ ] Bug fix
- [ ] New feature development
- [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [x] Other
```

## Objective

Add env output item in the changelog

## Before you submit

- Please add **unit tests** where it makes sense to do so (encouraged
but not required)

crates/bws/CHANGELOG.md

@@ -7,6 +7,10 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+### Added
+
+- Ability to output secrets in an `env` format with `bws` (#320)
+
 ## [0.3.1] - 2023-10-13
 
 ### Added