[Ionic v4] Method Datetime.open() missing

[peterpeterparker]

Ionic Info
@ionic/angular: "4.0.0-beta.0"

Describe the Bug
The method open() in Datetime hasn't been migrated

This method is particularly useful and needed if a date time picker would have to shown to the user but not triggered by an input field (for example if I want to open the date time picker from a button, like I do in my v3 app)

Expected Behavior
Migrate the method open() of Datetime to Ionic v4

[peterpeterparker]

Works like a charm in beta.3

 @ViewChild('myPicker', {read: Datetime}) myPicker: Datetime;

  something() {
     this.myPicker.open();
 }

[ionitron-bot]

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