Update readme.md (#426)

Treesitter inspections are now built-in

readme.md

@@ -577,11 +577,7 @@ output the highlight group for the value under the cursor.
 #### Treesitter highlighting
 
 If treesitter is the highlighting method for the language in question you can use the command:
-`:TSHighlightCapturesUnderCursor`. This command comes from the treesitter [playground] plugin. Make
-sure you have this installed as well as [nvim-treesitter].
-
-[playground]: https://github.com/nvim-treesitter/playground#show-treesitter-and-syntax-highlight-groups-under-the-cursor
-[nvim-treesitter]: https://github.com/nvim-treesitter/nvim-treesitter
+`:Inspect`.
 
 #### Vim highlighting