display download progress bar

[CarloLucibello]

It is useful when downloading large datasets.

[oxinabox]

Do you mean for 1 file or for multiple files?
For 1 file this issue needs to be openned on HTTP.jl as we use HTTP.download to do the download.
(unless you pass in a different fetch_method)
When I updated HTTP.download I had progress logging working: https://github.com/JuliaWeb/HTTP.jl/blob/7cab2ab077825aff366cc8e1e34db9d5566654bd/src/download.jl#L134
AFAICT It is still ProgressLogging.jl compatible.
Which means if you use Juno (pretty sure i tested this) or TerminalLoggers.jl a progress bar will show up rather than a %

For multiple files we could display a progress bar for the overall, in this package.

[TheCedarPrince]

Hey @oxinabox,

I opened an issue over HTTP.jl - hopefully I didn't butcher what you were discussing here but I would find this feature quite helpful. Thanks for the great package again!

P.S. Hopefully this addresses the comments also found in #145 #114 and #109