Update ws_client.py to support proxy

[AyliD]

#156

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[codecov-io]

Codecov Report

Merging #157 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #157   +/-   ##
=======================================
  Coverage   93.56%   93.56%           
=======================================
  Files          13       13           
  Lines        1384     1384           
=======================================
  Hits         1295     1295           
  Misses         89       89

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[AyliD]

/assign @roycaihw

[roycaihw]

/lgtm
/approve

Thanks for fixing this!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AyliD, roycaihw

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