Enhancement: Add Url

[localheinz]

This PR

• adds Url

[codecov]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #19   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       24     29    +5     
=======================================
  Files             6      8    +2     
  Lines            70     83   +13     
=======================================
+ Hits             70     83   +13

Impacted Files	Coverage Δ	Complexity Δ
src/Exception/InvalidUrl.php	100% <100%> (ø)	1 <1> (?)
src/Url.php	100% <100%> (ø)	4 <4> (?)

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