☀【Grunt】no such file or directory, imagemin

JPG image optimization not working
https://github.com/gruntjs/grunt-contrib-imagemin/issues/16

npm uninstall grunt-contrib-imagemin && npm install grunt-contrib-imagemin

node-jpegtran-bin
https://github.com/yeoman/node-jpegtran-bin

npm install --save jpegtran-bin

换个路径好了，把路径下的其他图片删掉也好了