build: update rollup to version 2.9.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	dependencies	minor	2.8.2 -> 2.9.1

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Release Notes

rollup/rollup

v2.9.1

Compare Source

2020-05-11

Bug Fixes

• Do not create unintended live-bindings or invalid reexports when reexporting global variables (#​3550)

Pull Requests

• #​3550: Track updates of globals that are exported as default (@​lukastaegert)

v2.9.0

Compare Source

2020-05-10

Features

• Add ids of static and dynamic imports to this.getModuleInfo (#​3542)
• Provide getModuleInfo and getModuleIds to manualChunks functions (#​3542)
• Add nullish coalescing support (#​3548)
• Make the rebuild delay in watch mode configurable and set the default to 0 for snappy rebuilds (#​3502)
• Add this.getModuleIds to the plugin context as future replacement for this.moduleIds (#​3542)

Pull Requests

• #​3502: Configurable build delay (@​mattdesl)
• #​3542: Extend manualChunks API (@​lukastaegert)
• #​3548: Support nullish coalescing with tree-shaking (@​lukastaegert)

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