allow multiple hosts

[mimmi20]

Fixes #50

[codecov]

Codecov Report

Merging #51 (4e37f9f) into master (5dcc0c3) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master       #51   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        21        26    +5     
===========================================
  Files              4         4           
  Lines             52        67   +15     
===========================================
+ Hits              52        67   +15     

Flag	Coverage Δ
7.4	100.00% <100.00%> (ø)
8	100.00% <100.00%> (ø)
8.1	100.00% <100.00%> (ø)
php-7.4	100.00% <100.00%> (ø)
php-8.0	100.00% <100.00%> (ø)
php-8.1	100.00% <100.00%> (ø)
phpunit	100.00% <100.00%> (ø)
ubuntu-18.04	100.00% <100.00%> (ø)
ubuntu-20.04	100.00% <100.00%> (ø)
xdebug	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/Router/HostName.php	100.00% <100.00%> (ø)

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