chore(deps): update dependency rollup to v2.18.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	patch	2.18.1 -> 2.18.2

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Release Notes

rollup/rollup

v2.18.2

Compare Source

2020-07-02

Bug Fixes

• Do not remove spread element args when the corresponding positional parameter is unused (#​3652)

Pull Requests

• #​3652: Do not tree-shake arguments that contain a spread element (@​lukastaegert)

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