Update webpack-dev-server from 2.9.1 to 2.9.2 in examples/vue-kitchen-sink

[dependencies]

webpack-dev-server has been updated to 2.9.2 in examples/vue-kitchen-sink by dependencies.io

2.9.2

Bugfixes

Changed property descriptor for Array.includes polyfill (#1134)

Updates

Remove header additional property validation (#1115)
Allow explicitly setting the protocol from the public option (#1117)
Updates readme with support, usage, and caveats (outlines no support for old IE)

[codecov]

Codecov Report

Merging #2055 into master will increase coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2055      +/-   ##
==========================================
+ Coverage   21.34%   21.69%   +0.34%     
==========================================
  Files         262      262              
  Lines        5767     5790      +23     
  Branches      687      800     +113     
==========================================
+ Hits         1231     1256      +25     
+ Misses       4031     3948      -83     
- Partials      505      586      +81

Impacted Files	Coverage Δ
app/react/src/server/utils.js	0% <0%> (-53.58%)	⬇️
app/react/src/server/babel_config.js	66.66% <0%> (-10.76%)	⬇️
app/react/src/client/preview/error_display.js	0% <0%> (ø)	⬆️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	47.36% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-build.js	0% <0%> (ø)	⬆️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
addons/knobs/src/components/PropField.js	10.86% <0%> (ø)	⬆️
lib/components/src/navigation/menu_link.js	0% <0%> (ø)	⬆️
... and 26 more

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