Update dependency rollup to v1.16.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup	devDependencies	patch	1.16.4 -> 1.16.6

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Release Notes

rollup/rollup

v1.16.6

Compare Source

2019-07-04

Bug Fixes

• Do not pass undefined to resolveDynamicImport for unresolvable template literals (#​2984)

Pull Requests

• #​2984: Always forward AST nodes for unresolvable dynamic imports (@​lukastaegert)

v1.16.5

Compare Source

2019-07-04

Bug Fixes

• onwarn should still be called when --silent is used (#​2982)
• Properly clean up watchers for files that are deleted between builds (#​2982)

Pull Requests

• #​2981: Do not skip onwarn handler when --silent is used (@​lukastaegert)
• #​2982: Make tests run on Node 12, fix watcher cleanup issue (@​lukastaegert)

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