make_changelog.sh

#! /usr/local/bin/zsh

echo "You probably want to run this from your master branch..."

# Remove any existing LATEST_CHANGES.md files:
rm LATEST_CHANGES.md

# Get the latest tag from the git index
LATEST_TAG=`git describe --abbrev=0`

# Concat each commit message between the last built tag and the current branch
git log $LATEST_TAG..HEAD --no-merges --pretty=%s > LATEST_CHANGES.md

# Open in SublimeText (Could use $EDITOR ENV var instead)
subl LATEST_CHANGES.md

I've been using this script to dump the most recent commit messages into a file. I then pick and re-write new features, squashed bugs, known issues and developer notes for the new release in the app's CHANGELOG.md file.