Update dependency webpack-merge to ^0.20.0

[mend-for-github-com]

This PR contains the following updates:

Package	Type	Update	Change
webpack-merge	devDependencies	minor	^0.8.4 -> ^0.20.0

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Release Notes

survivejs/webpack-merge

v0.20.0

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• Feature: Add support for merging functions. This feature has been designed postcss in mind. It executes the functions, picks their results, and packs them again.

v0.19.0

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• Feature: Add support for 'replace' option at merge.strategy. It literally replaces the old field value with the newer one. #​40

v0.18.0

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• Feature: Add support for recursive definitions at merge.strategy. Example:

var output = merge.strategy({
  entry: 'prepend',
  'module.loaders': 'prepend'
})(object1, object2, object3, ...);

• Feature: Add merge.smartStrategy. This combines the ideas of merge.smart and merge.strategy into one. Example:

var output = merge.smartStrategy({
  entry: 'prepend',
  'module.loaders': 'prepend'
})(object1, object2, object3, ...);

v0.17.0

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• Feature: Add support for merge.strategy. Now you can customize merging behavior per root level configuration field. Example: merge.strategy({ entry: 'prepend' })(object1, object2, object3, ...);. #​17

v0.16.0

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• Feature: Add support for webpack 2 at merge.smart. It should pick up module.rules as you might expect now. #​35

v0.15.0

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• Breaking: Rework merge.smart so that it appends loaders instead of prepending them. This is the logical thing to do as it allows you to specify behavior better as you merge. #​32

v0.14.1

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• Docs: Improve package description. #​23.
• Bug fix - Let merge.smart merge loaders based on their full name instead of first letter. Thanks to @​choffmeister. #​26.

v0.14.0

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• Feature: Allow merge.smart to merge loaders if exclude is the same. Thanks to @​mshwery. #​21.

v0.13.0

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• Bug fix: Allow merge.smart to merge configuration if include is defined. Thanks to @​blackrabbit99. #​20.

v0.12.0

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• Feature: Support include/exclude at merge.smart for loader definition too. Thanks to @​Whoaa512. #​16.

v0.11.0

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• Feature: Support include/exclude at merge.smart when its set only in a parent. #​15.

v0.10.0

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• Feature: Support include/exclude at merge.smart. Thanks to @​siready. #​14.

v0.9.0

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• Feature: Allow existing objects/arrays to be emptied with an empty object/array later in merge. This overriding behavior is useful for example emptying your entry configuration.

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