### Changes

**Add support for Cloudflare R2 object storage** (#26, 6b06299)

The fastenv object storage client supports AWS S3 and Backblaze B2.
This release will add support for the
[Cloudflare R2](https://developers.cloudflare.com/r2/)
object storage platform. Cloudflare R2 buckets can be supplied as
"virtual-hosted-style" URLs, like
`<BUCKET>.<ACCOUNT_ID>.r2.cloudflarestorage.com`.

**Add PUT uploads to object storage client** (#25, 6968353)

Dotenv files are commonly kept in cloud object storage. fastenv provides
an object storage client for downloading and uploading dotenv files.

S3-compatible object storage allows uploads with either `POST` or `PUT`.
This release will add an implementation of uploads with `PUT`, and `PUT`
will now be the default because `PUT` uploads are more widely-supported
and standardized. Backblaze B2 does not currently support single-part
uploads with `POST` to their S3 API (the
[B2 native API](https://www.backblaze.com/apidocs/b2-upload-file) must
be used instead).
[Cloudflare R2](https://developers.cloudflare.com/r2/api/s3/presigned-urls/)
does not support uploads with `POST` at all.

**Use Ruff for linting and formatting** (e635c33)

[Ruff](https://docs.astral.sh/ruff/) is a Python linter and formatter
that has gained popularity due to its high performance and numerous
capabilities. Now that Ruff has released its
[first minor version series](https://astral.sh/blog/ruff-v0.1.0) (0.1)
and has a [versioning policy](https://docs.astral.sh/ruff/versioning/),
it's a good time to consider adopting it.

As of this release, the project's Python linting and formatting checks
will be migrated from the previous tools (Black, Flake8, isort) to Ruff.

### Commits

- Bump version from 0.3.0 to 0.4.0 (620af5e)
- Add support for Cloudflare R2 object storage (#26) (6b06299)
- Add PUT uploads to object storage client (#25) (6968353)
- Remove trailing slash from `bucket_host` (8492656)
- Update test info in CONTRIBUTING.md (69bdf05)
- Update to `peter-evans/create-pull-request@v5` (4ddb5b5)
- Update to `aws-actions/configure-aws-credentials@v4` (e59316e)
- Update to `actions/checkout@v4` (ebdea31)
- Update CodeQL workflow actions (03e80cc)
- Address CodeQL URL substring sanitization error (a822a86)
- Remove scheme from `bucket_host` (aaf3f1d)
- Remove curly quote (0f2c1bb)
- Use Ruff for linting and formatting (e635c33)
- Add wheel build target to avoid Hatch `ValueError` (a7fffb7)
- Update to `pipx==1.4.1` (a53eb2b)
- Update to `mypy==1.8.0` (16c6329)
- Update to `hatch==1.9.1` (2ab4bff)
- Update to `pipx==1.4.0` (31c9854)
- Update to `pipx==1.3.3` (f5ddd6d)
- Remove unneeded stale workflow (d86b4ba)
- Switch from pre-commit to Hatch scripts (0f60779)
- Finish configuring code block copy (34fbe9a)
- Add docs deployment info to contributing.md (70b358e)
- Remove Material for MkDocs version from README (380f364)
- Configure Material for MkDocs code block copy (5c8b6ea)
- Update to Material for MkDocs 9 (a1349d4)
- Relax upper bound on HTTPX (ab0e909)
- Update to `mypy==1.7.0` (27549f5)
- Prepend `$HATCH_ENV` in GitHub Actions workflow (c5cf02d)
- Update to `hatch==1.7.0` (d8ee4e6)
- Remove Sourcery configuration file (9f61678)
- Update Black in pre-commit (6fd48d6)
- Update to `mypy==1.3.0` (e1a0e09)
- Update to coverage 7 (8702743)
- Update to `pipx==1.2.0` (dcbe73b)
- Update to mypy 1.1.1 (f666fdb)
- Update to configure-aws-credentials@v2 (5d20126)
- Update changelog for version 0.3.0 (#23) (d13a924)