Update dependency ng-packagr to ^5.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ng-packagr	devDependencies	minor	^5.5.1 -> ^5.6.0

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Release Notes

ng-packagr/ng-packagr

v5.6.0

Compare Source

Bug Fixes

• disable internal emitDecoratorMetadata (d0bf507)
• support the ng-package.json in secondary entry points (#​1406) (8b97bfa)
• update @​angular/cdk to version ~8.2.0 (0007fef)

Build System

• update @​angular-devkit/build-angular to version ~0.803.0 (194c6bb)
• update cross-env to version ^6.0.0 (120331a)
• update jasmine-core to version ~3.5.0 (#​1404) (aeabd95)
• update ts-node to version ~8.4.0 (9a4dddc)
• update tslint to version ~5.20.0 (4e4b1d5)
• update zone.js to version ^0.10.0 (88f8cb4)

Features

• copies CHANGELOG.md to package destination (db5ad68)

Tests

• update angular cli dev packages (3e26f7b)

5.5.1 (2019-09-14)

Bug Fixes

• add downlevelConstructorParameters transformer (b959010), closes #​1400
• remove terser warnings as these as not actionable (9c80f62), closes #​1394
• update rimraf to version ^3.0.0 (9236102)

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