Added Javadoc JAR to build

[freemanjp]

Required for Maven Central deployment.

[codecov]

Codecov Report

Merging #83 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #83   +/-   ##
=========================================
  Coverage     84.29%   84.29%           
  Complexity       82       82           
=========================================
  Files            15       15           
  Lines           452      452           
  Branches         60       60           
=========================================
  Hits            381      381           
  Misses           31       31           
  Partials         40       40

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