Make zone properties public

[marcvdm]

The only way to access the properties is to call toArray on the object.

I also made the service read only because this is validated so it should not change on the object.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (834a68e) 98.77% compared to head (bf4fd7f) 98.77%.

❗ Current head bf4fd7f differs from pull request most recent head 7709a0b. Consider uploading reports for the commit 7709a0b to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #75   +/-   ##
=========================================
  Coverage     98.77%   98.77%           
  Complexity      588      588           
=========================================
  Files           111      111           
  Lines          2295     2295           
=========================================
  Hits           2267     2267           
  Misses           28       28           

Files	Coverage Δ
src/Domain/Zone.php	100.00% <100.00%> (ø)

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