Allow passing multiple hosts to 'public'

[orteth01]

What kind of change does this PR introduce?
bugfix

Did you add or update the examples/?
no

Summary
Host checking was added by default in v2.4.3 for security reasons. Users now have to specify the host/URL being used to access the dev-server more info here

This PR allows users to specify multiple hosts that that will pass the check. This will fix this person's issue

Does this PR introduce a breaking change?
no

[jsf-clabot]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #896 into master will increase coverage by 0.29%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #896      +/-   ##
==========================================
+ Coverage   73.62%   73.92%   +0.29%     
==========================================
  Files           4        4              
  Lines         436      441       +5     
  Branches      130      133       +3     
==========================================
+ Hits          321      326       +5     
  Misses        115      115

Impacted Files	Coverage Δ
lib/Server.js	82.62% <75%> (-0.38%)	⬇️
lib/OptionsValidationError.js	60.86% <0%> (+1.73%)	⬆️

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[orteth01]

closing in favor of #899