chore(deps): update dependency rollup to v2.13.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	patch	2.13.0 -> 2.13.1

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Release Notes

rollup/rollup

### [`v2.13.1`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​2131) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.13.0...v2.13.1) _2020-06-04_ ##### Bug Fixes - Prevent conflicts in SystemJS when `module` is used as a top-level variable ([#​3614](https://togithub.com/rollup/rollup/issues/3614)) ##### Pull Requests - [#​3614](https://togithub.com/rollup/rollup/pull/3614): Handle system reserved identifier dedupes ([@​guybedford](https://togithub.com/guybedford))

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