Apply suggestions from code review

Co-authored-by: Jacob Strieb <99368685+rbs-jacob@users.noreply.github.com>

Author: whyitfor

ofrak_core/CHANGELOG.md

@@ -8,7 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Added
 - Add OFRAK requirements, requirement to test mapping, test specifications ([#656](https://github.com/redballoonsecurity/ofrak/pull/656))
 - Add `-V, --version` flag to ofrak cli ([#652](https://github.com/redballoonsecurity/ofrak/pull/652))
-- Add LZ4 compression format unpacker and packer with support for all frame types (modern, legacy, skippable) ([#PLACEHOLDER](https://github.com/redballoonsecurity/ofrak/pull/PLACEHOLDER))
+- Add LZ4 compression format unpacker and packer with support for all frame types (modern, legacy, skippable) ([#661](https://github.com/redballoonsecurity/ofrak/pull/661))
 
 ### Fixed
 - `build_image.py` uses `OFRAK_DIR` from `extra_build_args` to identify `pytest_ofrak` location for develop builds ([#657](https://github.com/redballoonsecurity/ofrak/pull/657/))