Forked from https://github.com/jayzes/heroku-buildpack-pngquant
Changes since fork creation:
- Build release with Docker
- Add pngquant 2.12.2 release
Build with Docker:
git submodule update --init --recursive
docker build -t YOUR_IMAGE .
docker run -it -v pwd:/out -v pwd/src:/src YOUR_IMAGE:latest /build.sh