fix(v-divider): fix vertical prop in flex

Author: johnleider

src/stylus/components/_dividers.styl

@@ -21,6 +21,7 @@ theme(v-divider, "v-divider")
   &--vertical
     flex: 0 1 auto
     height: 100%
+    max-width: 1px
     min-width: 1px
     width: 1px