nb-datepicker with NbDateFnsModule not working

[tomadj]

Issue type

I'm submitting a ... (check one with "x")

• bug report
• feature request

Issue description

Hello,

Error bellow is throw but NbDateFnsDateModule is imported :

Can't format native date. To use custom formatting you have to install @nebular/moment or
@nebular/date-fns package and import NbMomentDateModule or NbDateFnsDateModule accordingly.

But not if I import NbMomentDateModule .

this error is throw in datepicker component :

NbBasePicker.prototype.ngOnChanges = function () {
        if (this.dateService instanceof NbNativeDateService && this.format) {
            throw new Error('Can\'t format native date. To use custom formatting you have to install @nebular/moment or ' +
                '@nebular/date-fns package and import NbMomentDateModule or NbDateFnsDateModule accordingly.' +
                'More information at "Formatting issue" ' +
                'https://akveo.github.io/nebular/docs/components/datepicker/overview#nbdatepickercomponent');
        }
    };

Maybe because NbDateFnsDateService extends NbNativeDateService ?

Thank's

Thomas

Angular, Nebular

    "@angular/cdk": "^7.1.1",
    "@angular/common": "^7.1.2",
    "@angular/compiler": "^7.1.2",
    "@angular/core": "^7.1.2",

    "@nebular/date-fns": "^3.0.1",
    "@nebular/moment": "^3.0.1",
    "@nebular/theme": "^3.0.1",

[ledsonsilva]

I'm also having this problem!

I have imported @nebular/date-fns into my component but I still get this error on console, speaking to import.

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