Mention playground in README (#1022)

czosel · web-flow · commit 2a584e7b04f5 · 2019-04-04T08:41:46.000+02:00
diff --git a/README.md b/README.md
@@ -73,6 +73,10 @@ array_map(
 );
 ```
 
+## Playground
+
+You can give the plugin a try in our [playground](https://loilo.github.io/prettier-php-playground/)!
+
 ## Install
 
 yarn:
