fix(angular): Allow different boolean value accessor attribute#17

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FrancoisDF wants to merge 3 commits intostenciljs:mainfrom FrancoisDF:master

Commits on Nov 19, 2019

Update boolean-value-accessor.ts
Francios Delpech
committed

Commits on Nov 20, 2019

use VALUE_ACCESSOR_TARGETATTR on boolean instead of checked
Francios Delpech
committed

Commits on Dec 3, 2019

merge with upstream
Francios Delpech
committed