Update dependency babel-loader to v8

[renovate]

This Pull Request updates devDependency babel-loader (source) from v7.1.5 to v8.0.2

Release Notes

v8.0.2

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• #​541 - A bunch of great README fixes
• #​574 - Add cacheCompression: false to disable GZip compression of the disk cache
• #​670 - Handle both 'sourceMap' and 'sourceMaps' options properly
• #​671 - Fix sourceMaps: 'inline' to work properly with babel-loader
• #​669 - Fix sourcemaps to work with Webpack's devtoolModuleFilenameTemplate placeholders

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v8.0.1

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• #​662 - docs: update README.md
• #​667 - docs: Remove babelrc from loader-specific options
• #​668 - Add a warning if you forget to install @babel/core or install babel-core.

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v8.0.0

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This is the first stable release of babel-loader for Babel 7.x.

• README updates
• Dropped peer dependency on betas and RCs, but left the backward-compat code we had for now to give people time to migrate

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This PR has been generated by Renovate Bot.