Specifying host when listening for WebpackDevServer

[Blackbaud-BobbyEarl]

Fixes blackbaud/skyux2#717

[codecov-io]

Codecov Report

Merging #257 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #257   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          54     54           
  Lines        1265   1265           
  Branches      190    190           
=====================================
  Hits         1265   1265

Flag	Coverage Δ
#builder	100% <100%> (ø)	⬆️
#runtime	100% <ø> (ø)	⬆️
#srcapp	100% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
cli/serve.js	100% <100%> (ø)	⬆️

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[Blackbaud-SteveBrush]

Assuming Brandon S.'s tests on Windows passed, I was also able to run two SPA's on my Mac.

[Blackbaud-BobbyEarl]

They did pass, as did my local testing on a Windows VM. Windows was the only affected system.

Ultimately, I believe http-party/node-portfinder#39 is the problem, but explicitly passing localhost into webpack-dev-server resolves it (they use portfinder under the hood too).