Update dependency rollup to v1.27.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup	devDependencies	patch	1.27.0 -> 1.27.2

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Release Notes

rollup/rollup

v1.27.2

Compare Source

2019-11-18

Bug Fixes

• Fix an issue where live bindings were not working correctly when using += in SystemJS (#​3242)

Pull Requests

• #​3242: Export updated assignments when using shorthand update assignment expressions in SystemJS (@​lukastaegert)

v1.27.1

Compare Source

2019-11-18

Bug Fixes

• Fix an issue where code after a switch-statement with removed cases was erroneously not included (#​3241)

Pull Requests

• #​3237: make acornOptions optional in parse() in docs (@​tjenkinson)
• #​3240: Update dependencies and fix vulnerability (@​lukastaegert)
• #​3241: Do not truncate after switch-statement with removed case (@​lukastaegert)

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