chore(deps-dev): Bump webpack from 3.10.0 to 3.12.0

[dependabot-preview]

Bumps webpack from 3.10.0 to 3.12.0.

Release notes

Sourced from webpack's releases.

v3.12.0

Bugfixes

• Sort modules by index by default
• fix hot.accept creating duplicates when using the DefinePlugin

v3.11.0

Features

• Parser supports new Foo expressions
• Evaluator supports bitwise and exponential operator
• Many config options supporting placeholder now also support functions
• add jsonpScriptType to specify script type for lazy loaded script tags
• update ajv

Bugfixes

• allow ident in schema
• ident is not lost when referencing by ident
• Prefer process.exitCode instead of process.exit
• workaround for bluebird warning in hot/signal
• Errors in child compilation now lead to global error
• Initial chunk are no longer part of the chunk manifest and no longer contribute to the hash
• don't crash on arrays with empty items
• workaround for node 8 and 9 bug while reading empty env values

Commits

• cce33c2 3.12.0
• 074cff8 Merge pull request #7216 from jordwest/webpack-3
• 552d05e lint fix
• fbfe206 consistent function style
• a485103 Fix regession in Compilation.sortModules
• 645400a Merge pull request #7083 from justinhelmer/bug/6919
• 1fa85a8 test webpack-3 branch too
• 8ae762b hot.accept parser stops traversing based on number of args
• f010546 update examples
• bc840ec 3.11.0
• Additional commits viewable in compare view

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