chore(deps): update rollup to v2.0.3

[thi-bot]

This PR contains the following updates:

Package	Update	Type	Change	Sourcegraph
rollup (source)	patch	devDependencies	2.0.2 -> 2.0.3

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Release Notes

rollup/rollup

### [`v2.0.3`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​203) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.0.2...v2.0.3) _2020-03-10_ ##### Bug Fixes - Add type for this.getCombinedSourcemap to transform context ([#​3431](https://togithub.com/rollup/rollup/issues/3431)) ##### Pull Requests - [#​3377](https://togithub.com/rollup/rollup/pull/3377): Switch to yargs-parser lib ([@​jamesgeorge007](https://togithub.com/jamesgeorge007)) - [#​3426](https://togithub.com/rollup/rollup/pull/3426): Use strict types with PluginDriver ([@​NotWoods](https://togithub.com/NotWoods)) - [#​3431](https://togithub.com/rollup/rollup/pull/3431): Add missing type declaration for getCombinedSourcemap ([@​Anidetrix](https://togithub.com/Anidetrix)) - [#​3432](https://togithub.com/rollup/rollup/pull/3432): Detail how return values from `augmentChunkHash` are used ([@​jakearchibald](https://togithub.com/jakearchibald))

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