Update publishing to Maven central.

[JonathanLennox]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.29%. Comparing base (6592102) to head (5b67b29).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #150   +/-   ##
=========================================
  Coverage     42.29%   42.29%           
  Complexity      269      269           
=========================================
  Files            59       59           
  Lines          2487     2487           
  Branches        345      345           
=========================================
  Hits           1052     1052           
  Misses         1354     1354           
  Partials         81       81           

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[bgrozev]

@damencho @ibauersachs FYI