Update dependency webpack-merge to v0.20.0

This MR contains the following updates:

Package	Type	Update	Change
webpack-merge	devDependencies	minor	0.14.1 -> 0.20.0

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This MR has been generated by Renovate Bot.

mentioned in issue #1143 (closed)

marked the checklist item If you want to rebase/retry this MR, click this checkbox. as completed

marked the checklist item If you want to rebase/retry this MR, click this checkbox. as incomplete

added 134 commits

• 818cb031...f71f101f - 133 commits from branch develop
• 8a55f21a - Update dependency webpack-merge to v0.20.0

Compare with previous version

merged

mentioned in commit 62fcc165