Bumps webpack-merge from 5.2.0 to 5.4.0.

Sourced from webpack-merge's changelog.

5.4.0 / 2020-10-30

• Fix - Fall back correctly in mergeWithRules for cases that aren't matched. #157 #158
• Fix - Don't throw if using mergeWithRules without a rule #151
• Feat - Throw if undefined is passed to merge as a structure to merge

5.3.0 / 2020-10-30

• Fix - Expose Configuration type through a generic to TypeScript to support both webpack 4 and 5 #141 #154

In case you use webpack 4, please change your typing as instructed in the readme as the default type is loose but non-breaking.

• 33c3768 5.4.0
• 106f586 chore: Update change log
• 01cd2ba feat: Throw when an undefined is passed
• 07e21c1 fix: Don't crash without a rule
• 08c88c1 fix: Fall back to default merging in mergeWithRules (#158)
• 250503f 5.3.0
• 08f2f29 chore: Update changelog
• 2c2ec24 fix: Fix TypeScript for webpack 5 (#155)
• fdb2968 chore: Add contributing docs
• See full diff in compare view

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