Endorsed MockitoTestNGListener in the documentation

[slawekjaranowski]

After the latest changes in MockitoTestNGListener I sure that can be used without worry.

check list

• Read the contributing guide
• PR should be motivated, i.e. what does it fix, why, and if relevant how
• If possible / relevant include an example in the description, that could help all readers
  including project members to get a better picture of the change
• Avoid other runtime dependencies
• Meaningful commit history ; intention is important please rebase your commit history so that each
  commit is meaningful and help the people that will explore a change in 2 years
• The pull request follows coding style
• Mention Fixes #<issue number> in the description if relevant
• At least one commit should mention Fixes #<issue number> if relevant

[codecov-io]

Codecov Report

Merging #2140 (dddcc0a) into release/3.x (b10d833) will increase coverage by 0.02%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##             release/3.x    #2140      +/-   ##
=================================================
+ Coverage          84.88%   84.90%   +0.02%     
  Complexity          2721     2721              
=================================================
  Files                325      325              
  Lines               8277     8277              
  Branches             989      989              
=================================================
+ Hits                7026     7028       +2     
  Misses               980      980              
+ Partials             271      269       -2     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/org/mockito/Mockito.java	91.02% <ø> (ø)	55.00 <0.00> (ø)
...ain/java/org/mockito/junit/MockitoJUnitRunner.java	100.00% <ø> (ø)	5.00 <0.00> (ø)
...to/internal/util/concurrent/WeakConcurrentMap.java	41.48% <0.00%> (+2.12%)	11.00% <0.00%> (ø%)

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[slawekjaranowski]

@mockitoguy what do you think?