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

Compare Source

2020-06-04

Bug Fixes

• Prevent conflicts in SystemJS when module is used as a top-level variable (#​3614)

Pull Requests

• #​3614: Handle system reserved identifier dedupes (@​guybedford)

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