Bump versions of: gradle, release plugin, assertJ

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@ed68c06). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #30   +/-   ##
=========================================
  Coverage          ?   88.47%           
  Complexity        ?      231           
=========================================
  Files             ?       31           
  Lines             ?      590           
  Branches          ?       44           
=========================================
  Hits              ?      522           
  Misses            ?       51           
  Partials          ?       17           

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[drapostolos]

• Bump versions of: gradle, release plugin, assertJ, mockito.
• Added circleCi
• Removed powermock dependency