Version 0.2.0

Cleaned up the javascript used by the input feedbacks and

New Features:

• new input feedback for shinyWidgets::pickerInput()
• new input feedback for shinyWidgets::airDatPickerInput() and shiny::dateRangeInput() Thanks @pcogis!
• a new loadingButton() input.
• a toast notification
• there are now new functions showFeedback() and hideFeedback() which can be used as an alternative to feedback()
• new valueBoxModule

Removed Features:

• the snackbar has been removed