build: update devdependency rollup to ~2.11.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	minor	~2.10.0 -> ~2.11.0

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Release Notes

rollup/rollup

v2.11.2

Compare Source

2020-05-28

Bug Fixes

• Include side-effects in the second argument of Array.from (#​3604)

Pull Requests

• #​3604: Mark Array.from as side-effectful, use two-argument Array.from when mapping Sets (@​lukastaegert)

v2.11.1

Compare Source

2020-05-28

Bug Fixes

• Also include side-effects in files that are marked as side-effect-free if they contain an included default export that is reexported (#​3602)

Pull Requests

• #​3602: Handle side-effects next to side-effect-free default exports in case the default export is reexported (@​lukastaegert)

v2.11.0

Compare Source

2020-05-27

Features

• Add basic support for optional chaining (#​3582)
• Provide a normalized set of options with proper default values to buildStart and renderStart (#​3597)
• Do not count adding properties to the prototype of an unused class as a side-effect (#​3598)
• Support providing null for empty setters in SystemJS via option (#​3592)

Bug Fixes

• Do not fail when using a /*#__PURE__*/ annotation inside a class field (#​3599)
• Allow using --watch and --treeshake together with sub-options such as --watch.clearScreen on the command line (#​3597)

Pull Requests

• #​3582: Support optional chaining via acorn fork(@​guybedford)
• #​3592: System format optional setters(@​guybedford)
• #​3597: Provide normalized options (@​lukastaegert)
• #​3598: Treeshake prototype modifications in classes (@​lukastaegert)
• #​3599: Retain pure annotations in class fields (@​lukastaegert)
• #​3601: Fix white-space in docs (@​tu4mo)

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