Add darwin support for installws command

[tboulogne]

Hello,

Back on track for the darwin support.
Thanks to merge please.

Thierry

[coveralls]

Pull Request Test Coverage Report for Build 177

• 0 of 8 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.6%) to 47.196%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
instant/management/commands/installws.py	0	8	0.0%

Files with Coverage Reduction	New Missed Lines	%
instant/management/commands/installws.py	1	0.0%

Totals
Change from base Build 175:	-0.6%
Covered Lines:	232
Relevant Lines:	472

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💛 - Coveralls

[synw]

Thanks Thierry.

Btw a word on the status of this module: it has not been updated to use Centrifugo 2 because of some changes in my situation make that I don't use it anymore and I can not invest time in its maintenance for now. So if you are up to get more involved in maintaining this module you are welcome. There is quite a lot of work to move it to Centrifugo 2 as things changed in this new version.