Optimize images based on mime content instead of file extension.

[rdok-pigogo]

Fails when the image extension is different than mime type.

We have shops logo, given by external api.

Where, even though a file might have extension of type 'png', it's mime type is a 'gif'.

In those cases, the library throws an exception:

Command failed, return code: 25, command: /usr/bin/pngquant '--force' '--ext=.png' '--' '/home/vagrant/Code/pigogo/pigogo/public/user-assets/Files/stores/mg-manager.png' 1> /dev/null 2> /dev/null Dev note: Probably the image is a different type than that of file extension.

This pull request fixes this.

TODO:

• Verify all different mime types. The current tests verifies .png with jpg mime type
• Guard against invalid mime types: should throw exception if file mime type is other than the acceptable ones.

[approached]

Really good solution.

Thank you for the contributing this package.