Added Prerelase and BuildMetadata getters for Version and RelaxedVersion

[cmaglie]

Fix #24

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a3a0359) to head (1b39bf5).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #26   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines         1126      1138   +12     
=========================================
+ Hits          1126      1138   +12     

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