Update dependency webpack-merge to v4.2.2

This MR contains the following updates:

Package	Type	Update	Change
webpack-merge	devDependencies	minor	4.1.4 -> 4.2.2

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Release Notes

survivejs/webpack-merge

v4.2.2

Compare Source

• Fix - Update minimum version of lodash to 4.17.15 in order to avoid npm audit warning. #​116
• Docs - Improve merge.unique documentation. #​103
• Docs - Add clear note about precedence. #​115

v4.2.1

Compare Source

• Feature - Support oneOf at merge.smart. #​111
• Fix - If there's only single array to merge, clone it. #​106

v4.1.5

Compare Source

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