Update README

because I read one line, so there was 1 line I wanted to change.

README.md

@@ -30,7 +30,7 @@ Moving slowly, showing each command
 {
   "aaronik/treewalker.nvim",
   opts = {
-    highlight = true -- briefly highlight the node after jumping to it
+    highlight = true -- Whether to briefly highlight the node after jumping to it
   }
 }
 ```