When changeDetection is ChangeDetectionStrategy.OnPush component is not working

[ssljivic]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Bug fix #57

• What is the current behavior? (You can also link to an open issue here) When used in inside a component with changeDetection: ChangeDetectionStrategy.OnPush loading bar does not work.

• What is the new behavior (if this is a feature change)? SlimLoadingBarComponent component should have changeDetection: ChangeDetectionStrategy.OnPush. It needs to inject private cd: ChangeDetectorRef and at the end of this.service.events.subscribe it should call this.cd.markForCheck(); This makes the component usable when changeDetection: ChangeDetectionStrategy.OnPush is used. Note that with redux/ngrx this change detection is very common.

[ssljivic]

@akserg any chance this PR for issue #57 can be merged and new release created soon?