Update dependency rollup to v1.19.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rollup	devDependencies	patch	1.19.2 -> 1.19.3

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Release Notes

rollup/rollup

### [`v1.19.3`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​1193) [Compare Source](https://togithub.com/rollup/rollup/compare/v1.19.2...v1.19.3) _2019-08-06_ ##### Bug Fixes - Fix wrong URLs in error messages ([#​3033](https://togithub.com/rollup/rollup/issues/3033)) ##### Pull Requests - [#​3033](https://togithub.com/rollup/rollup/pull/3033): Fix wrong URLs in error messages ([@​giraffate](https://togithub.com/giraffate))

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