[Feature request] - progress indicator

[JacobBlana]

Hello,
first of all i love your fork of the original tinypng plugin.. its great..

Now to the point, as we are moving away from grunt and trying gulp, we discovered that there is no indicator of progress.. So for example, if you try to upload 3Mb image to the server you are just waiting and have no visible feedback..

The grunt version https://github.com/marrone/grunt-tinypng has options.showProgress which prints you the progress bar of upload and download inside terminal..

Honestly this is not needed, you some visual feedback to terminal of what is going on.

Thanks for your time.

[stnvh]

Cheers for this, will look into getting a progress bar implemented for next release