Update static/usage/v8/datetime-button/format-options/index.md

Co-authored-by: Shawn Taylor <shawn@ionic.io>

Author: liamdebeasi

static/usage/v8/datetime-button/format-options/index.md

@@ -6,7 +6,7 @@ import vue from './vue.md';
 import angular from './angular.md';
 
 <Playground
-  version="7"
+  version="8"
   size="large"
   code={{
     javascript,