Update changelog

Author: SethMMorton

CHANGELOG.md

@@ -1,10 +1,24 @@
 Unreleased
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+### Changed
+
+- Modernize development infrastructure
+  (PR [#162](https://github.com/SethMMorton/natsort/issues/177))
+  - Use `ruff` instead of `flake8` and `black`
+  - Move all config to `pyproject.toml`
+  - Use `setuptools-scm` to track `__version__`
+  - Remove `bumpversion` for creating new releases
+  - Move to `src/` layout for repository
+
 ### Fixed
 
 - Eliminated mypy failure related to string literals
 
+### Removed
+
+- Python 3.7 support
+
 [8.4.0] - 2023-06-19
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