chore(deps): update dependency rollup to v2.32.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	minor	2.31.0 -> 2.32.0

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Release Notes

rollup/rollup

### [`v2.32.0`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​2320) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.31.0...v2.32.0) _2020-10-16_ ##### Features - Extend `preserveEntrySignatures` with a value `"exports-only"` to allow extension only if an entry does not have exports ([#​3823](https://togithub.com/rollup/rollup/issues/3823)) ##### Pull Requests - [#​3823](https://togithub.com/rollup/rollup/pull/3823): Add "exports-only" option to preserveSignature ([@​lukastaegert](https://togithub.com/lukastaegert))

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