feat: switch from setup.cfg to pyproject.toml + hatchling

CHANGELOG.md

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+
+# Changelog
+All notable changes to rattail_cognitive will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+
+## 0.3.6 (2023-06-01)
+
+* Replace ``setup.py`` contents with ``setup.cfg``.
+
+
+## 0.3.5 (2019-01-21)
+
+* Remove unused reference to ``cStringIO``.
+
+
+## 0.3.4 (2017-07-07)
+
+* Switch license to GPL v3 (no longer Affero)
+
+
+## 0.3.3
+
+* Refactor some config usage per rattail changes.
+
+
+## 0.3.2
+
+* Fix broken barcode commands.
+    
+  UPC wasn't working, and EAN wasn't even being attempted...
+
+
+## 0.3.1
+
+* Refactor ``rattail.hw.cognitive`` -> ``rattail_cognitive``.
+
+
+## 0.3a3
+
+- [general] Fixed namespace package declaration.
+
+- [general] Added initial Fabric script.
+
+
+## 0.3a2
+
+- Tweaked default label format.
+
+## 0.3a1
+
+-  Initial port to Rattail v0.3.