Added missing dependency on pyzmq

Created by: stefanoborini

Created by: codecov[bot]

Codecov Report

Merging #83 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #83   +/-   ##
=======================================
  Coverage   96.82%   96.82%           
=======================================
  Files          60       60           
  Lines         976      976           
  Branches       82       82           
=======================================
  Hits          945      945           
  Misses         23       23           
  Partials        8        8

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