Update dependency extract-text-webpack-plugin to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
extract-text-webpack-plugin	1.0.1 -> 3.0.2

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Release Notes

webpack-contrib/extract-text-webpack-plugin

v3.0.2

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Bug Fixes

• refer to the entrypoint instead of the first module (module.identifier) (#​601) (d5a1de2)

v3.0.1

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Bug Fixes

• index: stricter check for shouldExtract !== wasExtracted (#​605) (510704f)
• get real path from __filename instead of __dirname (NS) (8de6558)

v3.0.0

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Bug Fixes

• add missing options.ignoreOrder details in Error message (#​539) (dd43832)

Code Refactoring

• Apply webpack-defaults & webpack 3.x support (#​540) (7ae32d9)

BREAKING CHANGES

• Enforces engines of "node": ">=4.3.0 < 5.0.0 || >= 5.10

• refactor: DeprecationWarning: Chunk.modules 543

• Updates to Chunk.mapModules. This release is not backwards compatible with Webpack 2.x due to breaking changes in webpack/webpack#​4764

• fix: css generation order issue see: webpack/webpack#​5225

• Enforces peerDependencies of "webpack": "^3.1.0".

v2.1.2

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2.1.2 (2017-06-08)

v2.1.1

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Bug Fixes

• add a not null check for the content property before throwing error (#​404) (58dd5d3)
• loader: rm unnecessary this.cacheable (caching) (#​530) (c3cb091)
• don't extract from common async chunks (#​508) (e595417)
• validation schema (schema-utils) (#​527) (dfeb347)

v2.1.0

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Features

• The plugin filename accepts a function now. c9a19ad, closes #​423

v2.0.0

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2.0.0 (2017-02-24)

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