Fix domain name for the generated links

[Sh1d0w]

There is a bug, that if you've set your APP_URL to something different than localhost (e.g. using valet), all documentation and Postman links, including the link to the Postman collection will be generated with localhost as domain name.

This PR forces Laravel to use the domain name set in your configuration in order to generate the links correctly.

[codecov-io]

Codecov Report

Merging #458 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #458      +/-   ##
============================================
+ Coverage     92.22%   92.23%   +0.01%     
  Complexity      239      239              
============================================
  Files            12       12              
  Lines           566      567       +1     
============================================
+ Hits            522      523       +1     
  Misses           44       44

Impacted Files	Coverage Δ	Complexity Δ
src/Commands/GenerateDocumentation.php	95% <100%> (+0.04%)	40 <0> (ø)	⬇️

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