Update dependency rollup to v2.6.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	minor	2.3.4 -> 2.6.1

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Release Notes

rollup/rollup

v2.6.1

Compare Source

2020-04-12

Bug Fixes

• Close watch mode when stdin closes in a non-TTY environment (#​3493)

Pull Requests

• #​3493: Ensure --watch mode exits correctly when stdin is closed (@​jakesgordon)

v2.6.0

Compare Source

2020-04-10

Features

• Allow regular expressions to declare external modules (#​3482)

Pull Requests

• #​3482: Allow regular expressions in config.external (@​johannes-z)

v2.5.0

Compare Source

This version is identical to 2.4.0

v2.4.0

Compare Source

2020-04-09

Features

• Add support for most private and public class field features (#​3488)

Bug Fixes

• Do not replace this with undefined in class field definitions (#​3488)

Pull Requests

• #​3488: Rollup class fields support (@​guybedford and @​lukastaegert)

v2.3.5

Compare Source

2020-04-09

Bug Fixes

• Never remove labels when tree-shaking is disabled (#​3492)

Pull Requests

• #​3492: Always use a new inclusion context when including declarations of variables, always inlcude labels when not treeshaking (@​lukastaegert)

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