Add feature: show progress bar when downloading

[l3ouu4n9]

update mega.py to show progress bar when downloading with tqdm

[jhoffmann]

Why would you not add it to upload() as well?

[l3ouu4n9]

Well, I only need the download function. I can do the upload one as well, but it seems like they did not maintain this repository for almost a year.

[jhoffmann]

I copied the same code into upload and it works perfectly, it's too bad the maintainer isn't merging the PR's, but ty for the code anyways.

[l3ouu4n9]

That's great. You're welcome.