Update dependency rollup-plugin-serve to v2

This MR contains the following updates:

Package	Type	Update	Change
rollup-plugin-serve	devDependencies	major	^1.0.1 -> ^2.0.0

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Release Notes

thgh/rollup-plugin-serve

v2.0.0

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This MR has been generated by Renovate Bot.

added renovate label

mentioned in issue #60

mentioned in commit 7344302f

merged