Python-transfer-sh

thanks to tofuSCHNITZEL and cheeseandcereal

Let's branch from now on: never assume a quick fix with no issue before tagging

Bump relase with proper import for github.com/russross/blackfriday/v2

Binary releases
Thanks to n8225

Also with contributions from dopessoa and different55

Fix regression in Minio support for S3 when moving to AWS SDK

Thanks n8225

* Switched to GO111MODULE
* New `Dockerfile`
* Added ip whitelisting/blacklisting
* Fix for proxy on subpath
* Fix on `MaxDownloads` handling
* Added `X-Remaining-Downloads`/`X-Remaining-Days` headers in response
* Documentation improved
* S3 storage now uses AWS SDK

thanks to computeralex92 , JustAnotherArchivist , dopessoa , sente , maxnordlund , stefanbenten