CHANGELOG: convert to reference-style commit links

Replace inline commit links with reference-style links at the
bottom of the file for better readability.

Closes #45

Author: dannywillems

CHANGELOG.md

@@ -12,23 +12,17 @@ and this project adheres to
 
 ### Changed
 
-- Updated to Python 3.13+
-  ([65c5121](https://github.com/LeakIX/LeakIXClient-Python/commit/65c5121))
-- Updated l9format requirement from 1.3.1a3 to 1.3.2
-  ([0975c1c](https://github.com/LeakIX/LeakIXClient-Python/commit/0975c1c))
-- Updated fire requirement from ^0.5.0 to >=0.5,<0.8
-  ([7cb5dae](https://github.com/LeakIX/LeakIXClient-Python/commit/7cb5dae))
-- Bumped actions/setup-python from 5 to 6
-  ([b1bc0da](https://github.com/LeakIX/LeakIXClient-Python/commit/b1bc0da))
-- Bumped actions/checkout from 4 to 6
-  ([6777ad9](https://github.com/LeakIX/LeakIXClient-Python/commit/6777ad9))
+- Updated to Python 3.13+ ([65c5121])
+- Updated l9format requirement from 1.3.1a3 to 1.3.2 ([0975c1c])
+- Updated fire requirement from ^0.5.0 to >=0.5,<0.8 ([7cb5dae])
+- Bumped actions/setup-python from 5 to 6 ([b1bc0da])
+- Bumped actions/checkout from 4 to 6 ([6777ad9])
 
 ### Infrastructure
 
-- Added pip-audit security scanning to CI
-  ([62550bc](https://github.com/LeakIX/LeakIXClient-Python/commit/62550bc))
+- Added pip-audit security scanning to CI ([62550bc])
 - Added Dependabot configuration for Python and GitHub Actions
-  ([4dd4948](https://github.com/LeakIX/LeakIXClient-Python/commit/4dd4948))
+  ([4dd4948])
 
 ## [0.1.9] - Previous Release
 
@@ -47,3 +41,12 @@ and this project adheres to
 [unreleased]: https://github.com/LeakIX/LeakIXClient-Python/compare/v0.1.10...HEAD
 [0.1.10]: https://github.com/LeakIX/LeakIXClient-Python/compare/v0.1.9...v0.1.10
 [0.1.9]: https://github.com/LeakIX/LeakIXClient-Python/releases/tag/v0.1.9
+
+<!-- Commit links -->
+[65c5121]: https://github.com/LeakIX/LeakIXClient-Python/commit/65c5121
+[0975c1c]: https://github.com/LeakIX/LeakIXClient-Python/commit/0975c1c
+[7cb5dae]: https://github.com/LeakIX/LeakIXClient-Python/commit/7cb5dae
+[b1bc0da]: https://github.com/LeakIX/LeakIXClient-Python/commit/b1bc0da
+[6777ad9]: https://github.com/LeakIX/LeakIXClient-Python/commit/6777ad9
+[62550bc]: https://github.com/LeakIX/LeakIXClient-Python/commit/62550bc
+[4dd4948]: https://github.com/LeakIX/LeakIXClient-Python/commit/4dd4948