Update dependency extract-text-webpack-plugin to v3.0.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
extract-text-webpack-plugin	devDependencies	patch	3.0.0 -> 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

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

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