chore(deps): update dependency rollup to v2.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	minor	2.7.6 -> 2.8.0

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Release Notes

rollup/rollup

### [`v2.8.0`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​280) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.7.6...v2.8.0) _2020-05-06_ ##### Features - When a dynamically imported chunk contains more exports than the imported module namespace, do not create a facade chunk but an inline namespace ([#​3535](https://togithub.com/rollup/rollup/issues/3535)) ##### Bug Fixes - Do not execute dynamically imported code before synchronous code in the importing module when generating CommonJS ([#​3535](https://togithub.com/rollup/rollup/issues/3535)) ##### Pull Requests - [#​3535](https://togithub.com/rollup/rollup/pull/3535): Avoid dynamic facade chunks ([@​lukastaegert](https://togithub.com/lukastaegert))

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