docs: update

README

@@ -255,15 +255,6 @@ ________________________________________________________________________________
   - If input doesn't follow this sequence, 'esc' is reset to '0'.
 
 
-* There is no usage of '[' or 'test'.
-
-  Despite these being commonly provided as "shell builtins" (part of the shell),
-  a lot of shells still use the external utilities from the coreutils. All usage
-  of these has been replaced with 'case' as it is always a "shell keyword".
-
-  This is one of the approaches taken to reduce the need for anything external.
-
-
 * Filename escaping works via looping over a string char by char.
 
   I didn't think this was possible in POSIX shell until I needed to do this in