docs: add note about postcss support

lmiller1990 · lmiller1990 · commit 2e8e86b4441c · 2020-07-03T17:00:28.000+10:00
diff --git a/README.md b/README.md
@@ -261,6 +261,7 @@ If a string is provided, it will be an assumed path to a TypeScript configuratio
       }
     }
     ```
+- **postcss** (`lang="pcss"`, `lang="postcss"`)
 
 ## CSS options
 

Original file line number	Diff line number	Diff line change
`@@ -261,6 +261,7 @@ If a string is provided, it will be an assumed path to a TypeScript configuratio`
`261`	`261`	`}`
`262`	`262`	`}`
`263`	`263`	```
	`264`	+- postcss (`lang="pcss"`, `lang="postcss"`)
`264`	`265`
`265`	`266`	`## CSS options`
`266`	`267`