chore(deps): update dependency rollup to v1.27.9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup	devDependencies	patch	1.27.8 -> 1.27.9

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Release Notes

rollup/rollup

v1.27.9

Compare Source

2019-12-07

Bug Fixes

• Fix an issue where reexports could be missing when preserving modules (#​3273)
• Allow turning of color output via NO_COLOR or FORCE_COLOR=0 environment variables (#​3272)

Pull Requests

• #​3272: Support either NO_COLOR or FORCE_COLOR=0 to turn off color (@​kikonen)
• #​3273: Make sure that indirectly reexported modules also become chunk dependencies when preserving modules(@​lukastaegert)

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