chore(deps): update devdependency rollup to v2.16.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	minor	2.15.0 -> 2.16.0

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Release Notes

rollup/rollup

### [`v2.16.0`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​2160) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.15.0...v2.16.0) _2020-06-12_ ##### Features - Add support for numeric separators ([#​3626](https://togithub.com/rollup/rollup/issues/3626)) - Switch to finalized ESTree optional chaining AST ([#​3628](https://togithub.com/rollup/rollup/issues/3628)) ##### Pull Requests - [#​3626](https://togithub.com/rollup/rollup/pull/3626): Support numeric separator ([@​TrySound](https://togithub.com/TrySound)) - [#​3628](https://togithub.com/rollup/rollup/pull/3628): Acorn 7.3.0 upgrade ([@​guybedford](https://togithub.com/guybedford)) - [#​3631](https://togithub.com/rollup/rollup/pull/3631): Improve discoverability of `manualChunks` for code splitting ([@​zlamma](https://togithub.com/zlamma))

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