Drop python 2 support and support Pyvisa >= 1.11

[MatthieuDartiailh]

Should close #52

Please test this pass the tests but I do not have anything more involved to test it on.

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@@            Coverage Diff            @@
##             master      #53   +/-   ##
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  Coverage          ?   86.10%           
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  Branches          ?        0           
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  Hits              ?      874           
  Misses            ?      141           
  Partials          ?        0           

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[Arkh42]

@MatthieuDartiailh I'm sorry if my question is trivial, but I don't know how to point to the new version of pyvisa-sim, as there is no new release, in my requirements.txt file. Can you tell me how to test your code change?

I load things with

pyvisa >= 1.9
pyvisa-sim >= 0.3

and, when I do, GitHub actions automatically load these packages

Collecting pyvisa>=1.9
  Downloading PyVISA-1.11.1-py3-none-any.whl (188 kB)
Collecting pyvisa-sim>=0.3
  Downloading PyVISA-sim-0.3.tar.gz (41 kB)

[MatthieuDartiailh]

Based on this stack overflow thread (https://stackoverflow.com/questions/16584552/how-to-state-in-requirements-txt-a-direct-github-source) the following line should work (you need to have git on your path):

git+git://github.com/pyvisa/pyvisa-sim@drop-py2#egg=pyvisa_sim

[Arkh42]

The issue is fixed with the change you made.
Thanks for your very quick reaction!

[MatthieuDartiailh]

Thanks for testing. I will do my best to merge and publish a release tonight.