chore: update README info about web playground (#481)

The web playground allows a few options to be specified now.

README.md

@@ -126,10 +126,7 @@ Here are some key differences between this package and [`slugify`](https://githu
 
 ## Playground
 
-A (painfully minimal) web playground is available at
-https://trott.github.io/slug/. It doesn't allow you to specify options, so it's utility is minimal. Pull requests welcome to add the ability to
-specify options.
+A web playground is available at https://trott.github.io/slug/.
 
-There is also a (similarly minimal) CLI tool available via `npx slug`.
-As with the web playground, it doesn't allow you to specify options, so
-it's utility is minimal.
+There is also a CLI tool available via `npx slug`. It doesn't allow you to
+specify options, so it's utility is minimal.