Update dependency rollup to v2.26.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	patch	2.26.1 -> 2.26.2

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Release Notes

rollup/rollup

### [`v2.26.2`](https://togithub.com/rollup/rollup/blob/master/CHANGELOG.md#​2262) [Compare Source](https://togithub.com/rollup/rollup/compare/v2.26.1...v2.26.2) _2020-08-16_ ##### Bug Fixes - Fix a situation where line-breaks in a simplified conditional expression could result in broken code ([#​3732](https://togithub.com/rollup/rollup/issues/3732)) ##### Pull Requests - [#​3732](https://togithub.com/rollup/rollup/pull/3732): Prevent unintended ASI for nested conditionals ([@​lukastaegert](https://togithub.com/lukastaegert))

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