Update dependency rollup to v1.27.12

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rollup	devDependencies	patch	1.27.11 -> 1.27.12

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Release Notes

rollup/rollup

### [`v1.27.12`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​12712) [Compare Source](https://togithub.com/rollup/rollup/compare/v1.27.11...v1.27.12) _2019-12-13_ ##### Bug Fixes - Prevent invalid AMD or SystemJS code when accessing `import.meta` ([#​3282](https://togithub.com/rollup/rollup/issues/3282)) ##### Pull Requests - [#​3282](https://togithub.com/rollup/rollup/pull/3282): Always make "module" available for SystemJS and AMD formats if `import.meta` is accessed directly ([@​lukastaegert](https://togithub.com/lukastaegert))

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