Avoid using version 17 of PyZMQ for now

[Peque]

See https://github.com/zeromq/pyzmq/issues/1170.

The test suite breaks with PyZMQ v17 while passes when pyzmq is set to <v17 (v16).

[codecov[bot]]

Codecov Report

Merging #302 into master will decrease coverage by 0.05%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #302      +/-   ##
==========================================
- Coverage   99.24%   99.19%   -0.06%     
==========================================
  Files          26       26              
  Lines        3588     3588              
  Branches      257      257              
==========================================
- Hits         3561     3559       -2     
- Misses         15       16       +1     
- Partials       12       13       +1

Impacted Files	Coverage Δ
osbrain/__init__.py	100% <100%> (ø)	:arrow_up:
osbrain/tests/test_bugs.py	83.33% <0%> (-16.67%)	:arrow_down:

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[ocaballeror]

303

Everything titled "for now" probably needs a new issue, so it doesn't become "for ever".

[Peque]

@ocaballeror I'd say "surely" instead of "probably". :stuck_out_tongue_winking_eye: