CHANGELOG.md: Add entry for PR #398

Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>

CHANGELOG.md

@@ -12,6 +12,7 @@
 * Fix crash when ignoring warning about `--magisk-preinit-device` not being specified ([PR #394])
 * When using `--ignore-magisk-warnings`, assume that unsupported Magisk versions newer than the latest supported version are capable of all features ([Issue #393], [PR #395])
 * Rebase our fork of bzip2-rs on top of v0.5.0 and switch to the Rust backend ([PR #397])
+* Minor code cleanup for custom integer range type ([PR #398])
 
 ### Version 3.10.0
 
@@ -420,3 +421,4 @@ Behind-the-scenes changes:
 [PR #394]: https://github.com/chenxiaolong/avbroot/pull/394
 [PR #395]: https://github.com/chenxiaolong/avbroot/pull/395
 [PR #397]: https://github.com/chenxiaolong/avbroot/pull/397
+[PR #398]: https://github.com/chenxiaolong/avbroot/pull/398