fix: align formatting of release notes with semantic release

[thisislawatts]

The default convention for semantic release is:

• Capitalized headers
• Bug Fixes before Features
• Lists of commit items

Reference:

• Underlying tooling https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-changelog-cli
• Example changelog: https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-changelog/CHANGELOG.md