build: update rollup to version ~2.18.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	minor	~2.17.0 -> ~2.18.0

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Release Notes

rollup/rollup

v2.18.0

Compare Source

2020-06-22

Features

• inlineDynamicImports, manualChunks and preserveModules can now be used as output options (#​3645)
• Use sourcemaps for certain warnings that reference source code locations (#​3645)

Bug Fixes

• this.getFileName will now always return the correct file name for chunks when multiple outputs are created (#​3645)

Pull Requests

• #​3645: Per output chunking (@​lukastaegert)

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