Update dependency rollup to v2.3.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	patch	2.3.3 -> 2.3.4

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Release Notes

rollup/rollup

v2.3.4

Compare Source

2020-04-07

Bug Fixes

• Handle re-exporting synthetic exports from entry-points (#​3319)
• Fix cross-chunk imports of synthetic exports (#​3319)
• Handle namespace objects that contain re-exported synthetic namespaces (#​3319)

Pull Requests

• #​3319: Handle re-exports of synthetic named exports (@​manucorporat and @​lukastaegert)

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