Enhancement: Allow creation of Year from current UTC time

[localheinz]

This PR

• allows the creation of a Year from current UTC time

Follows #23.

[codecov]

Codecov Report

Merging #24 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #24   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       36     37    +1     
=======================================
  Files             8      8           
  Lines           101    106    +5     
=======================================
+ Hits            101    106    +5

Impacted Files	Coverage Δ	Complexity Δ
src/Header/Year.php	100% <100%> (ø)	7 <1> (+1)	⬆️

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