3.9.0

[germanattanasio]

Summary

Cherry pick of develop to give more time for the team working on v4.0
I'm also going to merge master with develop. I don't expect to have problems because all the changes that are left in develop were files automatically generated.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@95923d1). Click here to learn what that means.
The diff coverage is 70%.

@@           Coverage Diff            @@
##             master    #776   +/-   ##
========================================
  Coverage          ?   59.9%           
  Complexity        ?    1917           
========================================
  Files             ?     416           
  Lines             ?    8877           
  Branches          ?     528           
========================================
  Hits              ?    5318           
  Misses            ?    3209           
  Partials          ?     350

Impacted Files	Coverage Δ	Complexity Δ
...tson/developer_cloud/http/HttpClientSingleton.java	82.97% <ø> (ø)	9 <0> (?)
.../ibm/watson/developer_cloud/util/RequestUtils.java	82.6% <100%> (ø)	18 <1> (?)
...eveloper_cloud/speech_to_text/v1/SpeechToText.java	80.54% <50%> (ø)	56 <0> (?)
.../watson/developer_cloud/service/WatsonService.java	63.24% <66.66%> (ø)	36 <3> (?)

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