feat: support url with imageExtensions save as same filename

[chenpx976]

[codetakki]

Hey, Thanks for your Pull request!

I check this out and found that having it always pick the name from the URL can lead to ugly formats:
example:
URL
https://apollo.open-resource.org/_media/mission:log:2014:12:19:github-pull-request-auto-merge-command-line.png
Becomes:
mission:log:2014:12:19:github-pull-request-auto-merge-command-line-2.png

I would not like this in my projects. Can you modify it to be part of the format options instead?
Something like "#{originalfilename}" or similar?

I also think the "extension" part is redundant, as we get the extension based on the header for the download request.

index.js

[chenpx976]

You're right I'll modify the code to use${originalfilename}

[codetakki]

@chenpx976 hey just checking in if you solved this