Update HISTORY.md

HISTORY.md

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 # cloudpathlib Changelog
 
+## UNRELEASED
+- Implement sliced downloads in GSClient. (Issue [#387](https://github.com/drivendataorg/cloudpathlib/issues/387), PR [#389](https://github.com/drivendataorg/cloudpathlib/pull/389))
+
 ## 0.17.0 (2023-12-21)
 
 - Fix `S3Client` cleanup via `Client.__del__` when `S3Client` encounters an exception during initialization. (Issue [#372](https://github.com/drivendataorg/cloudpathlib/issues/372), PR [#373](https://github.com/drivendataorg/cloudpathlib/pull/373), thanks to [@bryanwweber](https://github.com/bryanwweber))
 - Skip mtime checks during upload when force_overwrite_to_cloud is set to improve upload performance. (Issue [#379](https://github.com/drivendataorg/cloudpathlib/issues/379), PR [#380](https://github.com/drivendataorg/cloudpathlib/pull/380), thanks to [@Gilthans](https://github.com/Gilthans))
-- Implement sliced downloads in GSClient. (Issue [#387](https://github.com/drivendataorg/cloudpathlib/issues/387), PR [#389](https://github.com/drivendataorg/cloudpathlib/pull/389))
 
 ## v0.16.0 (2023-10-09)
  - Add "CloudPath" as return type on `__init__` for mypy issues. ([Issue #179](https://github.com/drivendataorg/cloudpathlib/issues/179), [PR #342](https://github.com/drivendataorg/cloudpathlib/pull/342))