chore(deps): update dependency rollup to v2.11.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	minor	2.10.9 -> 2.11.0

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Release Notes

rollup/rollup

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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