Update changelog for v17.0.0

Author: mlodewijck

CHANGELOG.md

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+# Changelog
+
+## 17.0.0 - 2025-09-28
+
+- Upgrade to Unicode 17.0.0.
+- Drop support for Python versions earlier than 3.8.
+
+## 16.0.0 - 2024-09-17
+
+- Upgrade to Unicode 16.0.0.
+
+## 15.1.0 - 2023-11-11
+
+- Upgrade to Unicode 15.1.0.
+
+## 15.0.0 - 2022-10-01
+
+- Upgrade to Unicode 15.0.0.
+
+## 14.0.0 - 2021-10-09
+
+- Upgrade to Unicode 14.0.0.
+
+## 13.0.0 - 2020-05-16
+
+_First release._