Update dependency babel-loader to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
babel-loader	devDependencies	major	^7.1.2 -> ^8.0.0

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Release Notes

babel/babel-loader

v8.0.6

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• Migrate to pify (#​785)
• Reduced memory usage (#​781)

v8.0.5

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• Update find-cache-dir to 2.0

v8.0.4

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• #​692 - Quick fix for typo

v8.0.3

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Features

• #​687 - Add customize option

Bugs

• #​685 - Also pass the caller option to loadPartialConfig

Docs

• #​681 - Update the README links to use the new options docs
• #​683 - Add .mjs to the examples

Internal

Some dev dependency updates and CI tweaks.

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

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.

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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[coveralls]

Coverage remained the same at 90.654% when pulling 04f2cd8 on renovate/babel-loader-8.x into fba3e2b on master.