pngquant failed to build, make sure that libpng-dev is installed

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sudo apt-get install libpng-dev
npm install -g pngquant-bin
如果还不行，再加上：
sudo apt-get install -y build-essential libpng-dev

如果第一个执行错误，那么先：
sudo apt-get update
sudo apt-get install libtiff5-dev libtiff5 libjbig-dev