fix(v-flex): add max-width
fix(v-flex): add max-width

when not given a size, v-flex can cause a container overflow, by default should have a max-width of
100%

vuetifyjs/vuetify,Phlow2001/vuetify,vuetifyjs/vuetify,Phlow2001/vuetify,vuetifyjs/vuetify,Phlow2001/vuetify,Webifi/vuetify,vuetifyjs/vuetify,Phlow2001/vuetify,Webifi/vuetify,Webifi/vuetify