Merge pull request #70 from lucianotonet/master

Update README.md

Author: adamwathan

README.md

@@ -120,6 +120,7 @@ There are a few items still on our todo list though that we are actively working
 - The `important` option does not yet support selectors (like `#app`).
 - Advanced PurgeCSS options like `safelist` aren't supported yet since we aren't actually using PurgeCSS. We'll add a way to safelist classes for sure though. For now, a `safelist.txt` file somewhere in your project with all the classes you want to safelist will work fine.
 - You can only `@apply` classes that are part of core, generated by plugins, or defined within a `@layer` rule. You can't `@apply` arbitrary CSS classes that aren't defined within a `@layer` rule.
+- Currently the JIT project **only supports PostCSS 8**. We may do a compat build like we do for Tailwind, but it isn't a priority right now.
 
 If you run into any other issues or find any bugs, please [open an issue](https://github.com/tailwindlabs/tailwindcss-jit/issues/new) so we can fix it.