Release v6.0.0

[lpatino10]

This PR has all of the changes for release v6.0.0.

Changes were made using the following:

• Codegen: f756e28916416a561d2b6cacde8df55114d19db2
• API definition: a348073912a66fc21439909db932fb54c9661653

Full details will be in the changelog.

[codecov-io]

Codecov Report

Merging #948 into master will decrease coverage by 0.02%.
The diff coverage is 71.57%.

@@             Coverage Diff              @@
##             master     #948      +/-   ##
============================================
- Coverage     65.49%   65.46%   -0.03%     
+ Complexity     2681     2655      -26     
============================================
  Files           565      564       -1     
  Lines         14469    14396      -73     
  Branches        841      824      -17     
============================================
- Hits           9477     9425      -52     
+ Misses         4561     4550      -11     
+ Partials        431      421      -10

Impacted Files	Coverage Δ	Complexity Δ
...loud/speech_to_text/v1/model/CreateJobOptions.java	71.9% <ø> (ø)	22 <0> (ø)	⬇️
...ud/visual_recognition/v3/model/ImageWithFaces.java	100% <ø> (ø)	6 <0> (ø)	⬇️
...developer_cloud/text_to_speech/v1/model/Voice.java	88.88% <ø> (ø)	8 <0> (ø)	⬇️
...oud/speech_to_text/v1/model/DeleteWordOptions.java	62.5% <ø> (ø)	3 <0> (ø)	⬇️
...oper_cloud/speech_to_text/v1/model/CustomWord.java	70% <ø> (ø)	4 <0> (ø)	⬇️
...eloper_cloud/visual_recognition/v3/model/Face.java	25% <ø> (ø)	1 <0> (ø)	⬇️
.../developer_cloud/conversation/v1/Conversation.java	71.17% <ø> (ø)	104 <0> (ø)	⬇️
...oud/speech_to_text/v1/model/SupportedFeatures.java	100% <ø> (ø)	3 <0> (ø)	⬇️
...xt/v1/websocket/SpeechToTextWebSocketListener.java	73.61% <ø> (ø)	13 <0> (ø)	⬇️
...per_cloud/speech_to_text/v1/model/SpeechModel.java	100% <ø> (ø)	8 <0> (ø)	⬇️
... and 34 more

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[mediumTaj]

👍 looks good!