build: update rollup to version ~2.17.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	devDependencies	minor	~2.16.0 -> ~2.17.0

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Release Notes

rollup/rollup

v2.17.0

Compare Source

2020-06-17

Features

• When importing Rollup via package.exports, always fall back to the browser ESM build for non-Node environments (#​3634)
• Create more efficient code when handling namespace mutations (#​3637)

Bug Fixes

• Fix a severe performance regression when the same module is imported by a lot of modules (#​3641)
• Properly escape special characters in imports (#​3638)

Pull Requests

• #​3634: Set browser build in exports (@​guybedford)
• #​3637: Do not include the whole namespace when illegally mutating a namespace (@​lukastaegert)
• #​3638: Support backslash escaping, retain exact newline escaping (@​guybedford)
• #​3641: Fix performance regression when a file is imported by many importers (@​lukastaegert)

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