[Borgbackup] how to use on machine with python2 intact

[Thomas Waldmann]

> AttributeError: 'module' object has no attribute 'scandir'
> 
> Platform: Linux webman 4.4.79.x86_64.1 #1 SMP Mon Jul 31 15:14:40 PDT 2017 x86_64 

If you use master branch, python 3.5 is the minimum requirement.
Using master for production is not recommended.

Maybe you rather want to use 1.1-maint branch (minimum python 3.4) or a
1.1 release candidate binary (includes python).

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