Update dependency rollup to v1.22.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup	devDependencies	minor	1.21.4 -> 1.22.0

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Release Notes

rollup/rollup

v1.22.0

Compare Source

2019-09-29

Features

• Add a new "hidden" sourcemap type that generates the map files but omits the sourcemap comment (#​3120)
• Generate more efficient code when using namespaceToStringTag: true (#​3135)
• Make sure namespace objects do not have a prototype (#​3136)

Bug Fixes

• Do not ignore side-effectful iterators by always preserving for..of loops for now (#​3132)
• Make sure --context is observed as a CLI option (#​3134)
• Do not require specific versions for @​types dependencies (#​3131)

Pull Requests

• #​3120: Generate sourcemaps but omit the comment (@​rohitmohan96)
• #​3131: Use asterisk for @​types/* dependencies (@​frenzzy)
• #​3132: Preserve empty for...of loops (@​imatlopez)
• #​3133: Update dependencies (@​lukastaegert)
• #​3134: Wire up --context CLI flag (@​tchetwin)
• #​3135: Remove Symbol polyfill in module namespaces (@​mkubilayk)
• #​3136: Set null prototype on namespace objects (@​rpamely)

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