added persistent prop for #143
added persistent prop for #143

stephane/vuetify,vuetifyjs/vuetify,Phlow2001/vuetify,Webifi/vuetify,KaelWD/vuetify,Webifi/vuetify,schmidigital/vuetify,KaelWD/vuetify,azaars/vuetify,vuetifyjs/vuetify,Webifi/vuetify,KaelWD/vuetify,Phlow2001/vuetify,schmidigital/vuetify,Phlow2001/vuetify,Phlow2001/vuetify,vuetifyjs/vuetify,azaars/vuetify,stephane/vuetify,vuetifyjs/vuetify,stephane/vuetify