Enhancement: Add Range

[localheinz]

This PR

• adds Years

[codecov]

Codecov Report

Merging #12 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #12   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       12     24   +12     
=======================================
  Files             4      6    +2     
  Lines            27     70   +43     
=======================================
+ Hits             27     70   +43

Impacted Files	Coverage Δ	Complexity Δ
src/Year.php	100% <100%> (ø)	6 <2> (+2)	⬆️
src/Exception/InvalidRange.php	100% <100%> (ø)	2 <2> (?)
src/Range.php	100% <100%> (ø)	8 <8> (?)

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