[Snyk] Upgrade rollup from 1.21.0 to 1.21.2

[snyk-bot]

Snyk has created this PR to upgrade rollup from 1.21.0 to 1.21.2.

• The recommended version is 2 versions ahead of your current version.
• The recommended version was released 9 days ago, on 2019-09-09.

Release notes

• 1.21.2 - 2019-09-09

  2019-09-09

  Bug Fixes

  • Fix wrong deprecation message to direct to this.emitFile instead of this.emitAsset
• 1.21.1 - 2019-09-09

  2019-09-09

  Bug Fixes

  • Allow legacy plugins to still add assets directly to the bundle object (#3105)

  Pull Requests

  • #3105: Allow legacy plugins to still add assets directly to the bundle object (@lukastaegert)
• 1.21.0 - 2019-09-08

  2019-09-08

  Features

  • Respect output.entryFileNames when preserving modules (#3088)
  • Make accessing unknown globals a side-effect unless this is deactivated via treeshake.unknownGlobalSideEffects (#3068)
  • Respect global objects when checking for pure global functions (#3068)
  • Introduce a type to more easily distinguish chunks and assets in the output bundle (#3080)

  Bug Fixes

  • Recover in watch mode when the initial build fails (#3081)
  • Make sure output.strict is respected for SystemJS output (#3101)

  Pull Requests

  • #3068: Make accessing unknown globals a side-effect (@lukastaegert)
  • #3080: OutputBundle Tagged union with 'type = chunk|asset' (@askbeka)
  • #3081: Watch files onbuild, even if build fails (@mhkeller)
  • #3088: Add support for entryFileNames pattern used in combination with preserveModules option (@Andarist)
  • #3101: Remove 'use strict'; from systemjs when strict=false (@askbeka)

from rollup GitHub Release Notes

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