diaspora-installer update for #986286

[Pirate Praveen <praveen@onenetbeyond.org>]

Hi,

diaspora-installer installation is broken in buster-backports because mime-magic gem got removed from rubygems.org due to a licensing oversight making its effective license as GPL instead of its upstream preferred license of MIT/Expat.

More details of the bug here, 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986286

It is already fixed in unstable, but due to freeze, testing migration will take 20 days. Would it be possible to give an exception to upload the version from unstable to buster-backports ?

Thanks
Praveen

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