Apply knotx java release plugin

[malaskowski]

Description

Releasing module using Gradle.

Motivation and Context

See https://github.com/Knotx/knotx-aggregator/issues/19

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

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I hereby agree to the terms of the Knot.x Contributor License Agreement.

[codecov[bot]]

Codecov Report

Merging #41 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #41   +/-   ##
=========================================
  Coverage     70.08%   70.08%           
  Complexity      109      109           
=========================================
  Files            20       20           
  Lines           488      488           
  Branches          6        6           
=========================================
  Hits            342      342           
  Misses          140      140           
  Partials          6        6           

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