Release v4.2.0

[lpatino10]

This PR updates Discovery to use the new NLU-based Enrichment models and fixes an issue with adding/updating configurations as described here.

It also adds back the old getProfileAsCSV() method to Personality Insights that had been missing since v4.0.0.

[codecov-io]

Codecov Report

Merging #836 into master will decrease coverage by 0.33%.
The diff coverage is 39.18%.

@@             Coverage Diff              @@
##             master     #836      +/-   ##
============================================
- Coverage      56.5%   56.17%   -0.34%     
+ Complexity     2202     2201       -1     
============================================
  Files           488      496       +8     
  Lines         11821    12014     +193     
  Branches        668      674       +6     
============================================
+ Hits           6680     6749      +69     
- Misses         4755     4879     +124     
  Partials        386      386

Impacted Files	Coverage Δ	Complexity Δ
.../personality_insights/v3/model/ProfileOptions.java	100% <ø> (ø)	10 <0> (-1)	⬇️
...developer_cloud/discovery/v1/model/Enrichment.java	68.18% <ø> (ø)	8 <0> (ø)	⬇️
...d/personality_insights/v3/PersonalityInsights.java	55.81% <0%> (-33.08%)	10 <0> (ø)
...oud/discovery/v1/model/NluEnrichmentRelations.java	0% <0%> (ø)	0 <0> (?)
...ud/discovery/v1/model/NluEnrichmentCategories.java	0% <0%> (ø)	0 <0> (?)
...cloud/discovery/v1/model/NluEnrichmentEmotion.java	39.13% <39.13%> (ø)	1 <1> (?)
...oud/discovery/v1/model/NluEnrichmentSentiment.java	39.13% <39.13%> (ø)	1 <1> (?)
...loud/discovery/v1/model/NluEnrichmentEntities.java	41.86% <41.86%> (ø)	1 <1> (?)
...discovery/v1/model/NluEnrichmentSemanticRoles.java	43.47% <43.47%> (ø)	1 <1> (?)
...loud/discovery/v1/model/NluEnrichmentFeatures.java	51.16% <51.16%> (ø)	1 <1> (?)
... and 11 more

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