[feature request] parallel download can be added

[emre-tiryaki]

Right now project does not support parallel downloading. It downloads sequentially.

I don't know how but parallel downloading can be added. This would improve speed and user experience.

This is just a feature suggestion. its not that important.

[abhixdd]

@emre-tiryaki Thanks. that's a great idea! I'll try to add it in the next release.