Added customization_id to the recognize() method.

[mlauret]

Added the 'customization_id' parameter in the 'customize()' method for speech to text, to be consistent with the API Documentation.

[jsstylos]

Looks perfect

[codecov-io]

Codecov Report

Merging #176 into master will decrease coverage by 2.9%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
- Coverage   82.67%   79.77%   -2.91%     
==========================================
  Files          24       24              
  Lines        1068     1068              
==========================================
- Hits          883      852      -31     
- Misses        185      216      +31

Impacted Files	Coverage Δ
watson_developer_cloud/speech_to_text_v1.py	100% <ø> (ø)	✅
watson_developer_cloud/language_translator_v2.py	44.82% <0%> (-31.04%)	❌
..._developer_cloud/watson_developer_cloud_service.py	61.9% <0%> (-9.53%)	❌
watson_developer_cloud/dialog_v1.py	38.88% <0%> (-5.56%)	❌
watson_developer_cloud/document_conversion_v1.py	93.75% <0%> (-3.13%)	❌

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