fix(deps): update dependency webpack to v3.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webpack	3.8.1 -> 3.12.0

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Release Notes

webpack/webpack

v3.12.0

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Bugfixes

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

v3.11.0

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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

v3.10.0

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Features:

• add publicPath and fileContext to SourceMapDevToolPlugin
• require.include no longer uses all exports (Tree Shaking)

v3.9.1

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Bugfixes:

• add ignored and stdin to schema of watchOptions

v3.9.0

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Features

• add more descriptions to the schema for better validation errors
• Handle arrow functions in AMD define/require

Bugfixes

• added stats.all option to schema
• UMD uses self before this as global object
• Use window instead of this in JSONP
• handle null in SourceMap correctly
• Use Error name instead of instanceof to check for validation Error
• Respect node.js deprecation configuration for some deprecation messages in webpack
• Generate shorter identifiers for ConcatenatedModules to save memory
• fix increasing delay when using HMR with multiStep: true

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