chore(deps): update dependency rollup to v2.26.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	patch	2.26.0 -> 2.26.1

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Release Notes

rollup/rollup

v2.26.1

Compare Source

2020-08-16

Bug Fixes

• Correctly render external namespace imports when only generating SystemJS output (#​3731)

Pull Requests

• #​3731: Render system namespace import (@​sastan and @​lukastaegert)

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[coveralls]

Coverage remained the same at 100.0% when pulling 05caf32 on renovate/rollup-2.x into 1f61da6 on master.

[travi-bot]

🎉 This PR is included in version 2.0.12 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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