chore(deps): update dependency clean-webpack-plugin to v2

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This PR contains the following updates:

Package	Type	Update	Change	References
clean-webpack-plugin	devDependencies	major	1.0.1 -> 2.0.0	source

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Release Notes

johnagan/clean-webpack-plugin

v2.0.0

Compare Source

README.md

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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