ngOnChanges is firing before ngOnInit

[Alois Rühling]

Hi,

first of all thank you for this wonderful project.

One thing I noticed an which was already addressed in angular (angular/angular#7782) is that ngOnChanges fires before ngOnInit.

Could you also align here and fire this event only after the ngOnInit was fired as this leads to boiler plate all over.

ng-metadata@4.0.1