Fix keyword argument naming for publisher

[pnuu]

This PR fixes a naming issue with a keyword argument passed to request_push().

Closes #77

[codecov]

Codecov Report

Merging #76 into master will increase coverage by 1.04%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   69.39%   70.44%   +1.04%     
==========================================
  Files          15       15              
  Lines        2905     2903       -2     
==========================================
+ Hits         2016     2045      +29     
+ Misses        889      858      -31     

Impacted Files	Coverage Δ
trollmoves/move_it_base.py	0.00% <0.00%> (ø)
trollmoves/tests/test_client.py	98.18% <ø> (ø)
trollmoves/client.py	70.23% <87.50%> (+3.61%)	⬆️
trollmoves/utils.py	71.76% <0.00%> (+8.23%)	⬆️

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[mraspaud]

LGTM