Add customization_weight parameter to recognize() for stt

[ammardodin]

Fixes #306

[codecov-io]

Codecov Report

Merging #309 into master will increase coverage by 0.02%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #309      +/-   ##
==========================================
+ Coverage   38.72%   38.75%   +0.02%     
==========================================
  Files          24       24              
  Lines        8292     8294       +2     
==========================================
+ Hits         3211     3214       +3     
+ Misses       5081     5080       -1

Impacted Files	Coverage Δ
watson_developer_cloud/speech_to_text_v1.py	98.86% <50%> (-1.14%)	⬇️
watson_developer_cloud/watson_service.py	83.62% <0%> (+0.86%)	⬆️

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[mkistler]

I think you can simply add

    'customization_weight': customization_weight,

into the params object above. The check for customization_weight is not None isn't needed because the service will strip it out, and the check for 'customization_id' shouldn't be needed because the service should simply ignore it when there is no customization_id.

[ammardodin]

Ah, touche. I see you're removing None values in the base service. Nice !! 👍

[mkistler]

Looks good! 👍