Build dependencies fix

[me-heer]

The maven plugin version defaults to Java 5, which ultimately, fails the build in a CI Service.
Solution:

• Configure maven plugin version to 3.8.0 which uses the later versions of Java (which is compatible with this repo)

Message to visitors: If this Pull Request does not get merged, use my Pull Request as a reference.

[codecov]

Codecov Report

Merging #25 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##             master   #25   +/-   ##
======================================
  Coverage        50%   50%           
  Complexity        2     2           
======================================
  Files             1     1           
  Lines             4     4           
======================================
  Hits              2     2           
  Misses            1     1           
  Partials          1     1

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[thomasrockhu]

Thanks @mformihir !