Fix Speech to Text bugs

[lpatino10]

Fixes #1004 and fixes #1005.

A ping interval was added in the recognizeUsingWebSocket() method to ensure that no timeouts occur. Apparently, this was causing issue #1004, according to this issue in the OkHttp repo.

[codecov-io]

Codecov Report

Merging #1006 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1006      +/-   ##
============================================
+ Coverage     64.58%   64.61%   +0.02%     
  Complexity     3099     3099              
============================================
  Files           679      679              
  Lines         16523    16525       +2     
  Branches        918      918              
============================================
+ Hits          10672    10677       +5     
+ Misses         5355     5353       -2     
+ Partials        496      495       -1

Impacted Files	Coverage Δ	Complexity Δ
...loud/speech_to_text/v1/model/RecognizeOptions.java	72.41% <100%> (+0.23%)	19 <0> (ø)	⬇️
...eveloper_cloud/speech_to_text/v1/SpeechToText.java	89.79% <100%> (+0.02%)	85 <0> (ø)	⬇️
.../watson/developer_cloud/service/WatsonService.java	58.85% <0%> (+1.56%)	41% <0%> (ø)	⬇️

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[mediumTaj]

👍 looks good! Will behavior be affected if the user sets inactivity_timeout?

[lpatino10]

Nope @mediumTaj, that should override the pings to close the connection. Good question though!