Update extract-text-webpack-plugin requirement to ^3.0.2

[dependabot-preview]

Updates the requirements on extract-text-webpack-plugin to permit the latest version.

Release notes

Sourced from extract-text-webpack-plugin's releases.

v3.0.2

2017-10-25

Bug Fixes

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

Changelog

Sourced from extract-text-webpack-plugin's changelog.

3.0.2 (2017-10-25)

Bug Fixes

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

3.0.1 (2017-10-03)

Bug Fixes

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

3.0.0 (2017-07-10)

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 Use a Set to store modules in a chunk webpack/webpack#4764

• fix: css generation order issue see: added sortModules method to Chunk class webpack/webpack#5225

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

3.0.0-rc.2 (2017-07-10)

... (truncated)

Commits

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[dependabot-preview]

Looks like extract-text-webpack-plugin is no longer updatable, so this is no longer needed.