Update dependency clean-webpack-plugin to v4 - abandoned

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
clean-webpack-plugin	^1.0.0 -> ^4.0.0

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Release Notes

johnagan/clean-webpack-plugin

v4.0.0

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Changes

• Added support for NodeJS 14
• Added support for webpack 5

Breaking changes:

• Dropped support for NodeJS 8
• Dropped support for webpack 3

v3.0.0

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• Removed Node 6 support
• Removed webpack 2 support
• cleanOnceBeforeBuildPatterns use emit hook instead of compile
• Do not clean files if webpack errors are present during initial build
• Replaced default export with named export CleanWebpackPlugin

// es modules
import { CleanWebpackPlugin } from 'clean-webpack-plugin';

// common js
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

v2.0.2

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v2.0.1

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v2.0.0

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Relavant:

• README.md
• Additional v2 information

Changes:

• No configuration is needed for standard usage (cleans webpack's output.path)
• By default during webpack's watch mode, only files created by webpack are removed
• Because del is used, globbing is supported
• Plugin is tested directly via webpack
• All supported versions are tested
• Windows is tested via appveyor (no mocked tests)
• Complete build system including prepublish hooks and git prepush/commit hooks
• Written with Typescript

Additional notes:

• Moved to CircleCI because Travis CI was sold and looks to now be in maintenance mode.
• Replaced Coveralls with codecov because automatic build merging works. This is important because of windows/different webpack version testing

Closes Issues: #​53 #​55 #​67 #​73 #​80 #​85 #​86 #​89 #​91 #​92 #​93 #​98
Closes PRs: #​39 #​74

Massive props to @​chrisblossom for working on this and pushing it through.

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