chore(deps): update dependency rollup to v2.18.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	patch	2.18.0 -> 2.18.1

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Release Notes

rollup/rollup

v2.18.1

Compare Source

2020-06-26

Bug Fixes

• Make sure synthetic exports are present when a module is imported dynamically (#​3648)
• Strip the rollup-plugin- prefix off the plugin name when looking for the plugin export in a CLI plugin without a default export (#​3647)
• Convert plugin names with dashes to camel case when looking for the plugin export in a CLI plugin without a default export (#​3647)

Pull Requests

• #​3647: Strip rollup-plugin prefix to find named plugin exports, throw when export cannot be found (@​lukastaegert)
• #​3648: Always create a dynamic namespace object when a module with synthetic named exports is imported dynamically (@​lukastaegert)

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