Fix Imgur links not being previewed and extra extension sometimes being added #169
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Imgur recently changed their website so that the direct links would redirect to the main website unless the
Referer
header was set tohttps://imgur.com/
This PR adds that header if the URL contains
imgur
and also prevents a duplicate.png
extension being added to direct links (this didn't appear to break anything, it just bugged me when I was logging the URL)