Fix: removes reference to coveralls plugin which is not useful because codecov is used to track code coverage

[jlerbsc]

Fixes #3115 .

[codecov]

Codecov Report

Merging #4235 (d446050) into master (240fc7a) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##              master     #4235   +/-   ##
===========================================
  Coverage     57.995%   57.995%           
  Complexity      2330      2330           
===========================================
  Files            647       647           
  Lines          34577     34577           
  Branches        5974      5974           
===========================================
  Hits           20053     20053           
  Misses         12366     12366           
  Partials        2158      2158           

Flag	Coverage Δ
AlsoSlowTests	57.995% <ø> (ø)
javaparser-core	50.537% <ø> (ø)
javaparser-symbol-solver	37.085% <ø> (ø)
jdk-10	57.983% <ø> (+0.002%)	⬆️
jdk-11	57.983% <ø> (ø)
jdk-12	57.983% <ø> (ø)
jdk-13	57.977% <ø> (ø)
jdk-14	57.983% <ø> (ø)
jdk-15	57.983% <ø> (ø)
jdk-16	57.957% <ø> (ø)
jdk-17	57.957% <ø> (ø)
jdk-8	57.974% <ø> (-0.006%)	⬇️
jdk-9	57.983% <ø> (ø)
macos-latest	57.986% <ø> (-0.003%)	⬇️
ubuntu-latest	57.983% <ø> (ø)
windows-latest	57.977% <ø> (ø)

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