Update README.

Author: fjwright

README.md

@@ -34,8 +34,9 @@ IDEA](https://www.jetbrains.com/idea/) with Run-REDUCE-FX as the
 top-level directory.
 
 Run-REDUCE-FX currently uses a bundled copy of
-[KaTeX](https://katex.org/) to render LaTeX output by the REDUCE
-*fmprint* package when the *Typeset Maths* option is selected.
+[KaTeX](https://katex.org/) to render LaTeX output by code based on
+the REDUCE *tmprint* package when the *Typeset Maths* option is
+selected.
 
 ## Release Notes
 
@@ -217,3 +218,44 @@ Run-REDUCE-FX currently uses a bundled copy of
   * Substantial revision to fix some subtle misbehaviour.
 
 ### Updates since last release
+
+* Set minimum size for the main window.  Allow space at the bottom of
+  the main display so that the horizontal scroll bar does not obscure
+  the prompt.
+* v2.21 Make "Generic information for all REDUCE commands" fields all
+  optional, resetting to defaults where appropriate.  Correct the
+  behaviour to allow the REDUCE Root Directory text field to be empty,
+  and to use the Command Root Directory if it is set.
+* Add line breaking support to the new code for displaying
+  identifiers.
+* Add support for conditional fancy!-functionsymbol properties that
+  are association lists of pairs of the form `(arity . symbol)` and
+  use it for the gamma function.
+* v2.22 Fix fancy!-out!-item() so as not to hang the GUI if an error
+  occurs and to output a more useful error message.
+* Process _bar in an identifier as an over-bar even if it is followed
+  by digits or _k.
+* Set switch ACN on by default, since it seems to improve display with
+  ON LIST.
+* Add fancy!-assgnpri!-matrix() to display matrix assignments as
+  assignments.
+* Remove the declaration of fancy!-symbol!-length for setq and let it
+  default to 4, which seems appropriate.  In fancy!-oprin, if `!*list`
+  then break the line if `sumlevel!*` is 2 or 3; including 3 is a hack
+  to fix the `on list` example in "alg.tst".
+* v2.23 Use fancy!-functionsymbol rather than fancy!-special!-symbol
+  for function names and set fancy!-symbol!-length as appropriate for
+  function names.  Stop using `(ascii n)`, but retain support for it.
+  Tidy up some of the functions for displaying special functions.
+  This shortens some lines in `symbols_and_functions.tst` output.
+* Display abs(x) as |x| and add abs to `symbols_and_functions.tst`.
+* Display multiple matrix assignment correctly, e.g. `a := b :=
+  mat(...)`.
+* Use a character width of 2 instead of 1 in fancy!-tex!-character().
+* Remove all superfluous space around commas in algebraic lists and
+  flat printed matrix rows.
+* Improve automatic scrolling to the bottom of the display pane.
+* v2.24 Add a *Restart REDUCE* item to the REDUCE menu to do a full
+  clean restart of the last-run REDUCE command.
+* Give sqrt a width of 3 but remove the width of the n in an nth root.
+  The output from "int.tst" is now reasonable.