Add support for updating picker when underlaying select changes

[omarsaab96]

@AuHau @taavs I am dynamically adding an option to the tag, but can't find a way for the plugin to refresh the dropdown list after initialization. Any help would be highly appreciated.

[AuHau]

Hmm, I am afraid that this use-case is not supported. You could call $('...').picker('destroy'); when you add a new option and then reinitialize Picker as a workaround but yeah not really a great solution.