Fix infinite loop with controlled components

[jacobmischka]

Because of this line in flatpickr, if you don't explicitly pass false to setDate it will trigger events, including the onChange event. This leads to an infinite loop when using this package as a controlled component.

Alternatively, I believe you can bind to onValueUpdate instead of onChange, that's what the vue version of this package does and it doesn't seem to suffer from this issue.

[haoxins]

thanks, v3.1.1 published :)

[jacobmischka]

Looks like this was fixed in flatpickr, so if you want to you can remove this now. It doesn't hurt anything to leave it in though. Thanks!

[ndinhphi]

@coderhaoxin could you please take a look #43. Thank you so much!