Increment the version number for testing.

Readme.md

-# STACK 4.3 (beta)
+# STACK 4.3
 
-[STACK](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/About/index.md) is an assessment system for mathematics, science and related disciplines.
+STACK is an assessment system for mathematics, science and related disciplines.  STACK is a question type for the Moodle learning management system, and also the ILIAS learning management system.
 
-STACK was created by [Chris Sangwin](http://www.maths.ed.ac.uk/~csangwin/) of the University of Edinburgh, and includes the work of many [other contributors](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/About/Credits.md). A demonstration server is available in Edinburgh:  [https://stack.maths.ed.ac.uk/demo](https://stack.maths.ed.ac.uk/demo).
+STACK was created by [Chris Sangwin](http://www.maths.ed.ac.uk/~csangwin/) of the University of Edinburgh, and includes the work of many [other contributors](https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/About/Credits.md). A demonstration server is available at the University of Edinburgh:  [https://stack.maths.ed.ac.uk/](https://stack.maths.ed.ac.uk/).
 
 STACK is based on continuing research and use at the University of Edinburgh, the Open University, Aalto, Loughborough University, the University of Birmingham and others.
 

doc/en/Developer/Development_track.md

@@ -9,14 +9,14 @@ How to report bugs and make suggestions is described on the [community](../About
 
 Version 4.3 represents a major internal re-engineering of STACK, with a new dedicated parser and an updated mechanism for connecting to Maxima.  This is a significant improvement, refactoring some of the oldest code and unblocking progress to a wide range of requested features.
 
-CHANGES:
+There have been a number of changes:
 
 * In the forbidden words we now match whole words not substrings.
 * Removed the RegExp answer test.
 * Use of units is now reflected throughout a question.  This reduces the need to declare units in all contexts.
 * Internally, the "+-" operator has been replaced with a new infix operation "#pm#".  Instead of `a+-b` teachers now must type `a#pm#b`.  This change was necessary to deal with differences between versions of Maxima when dealing with expresions.
 
-DONE:
+New features in v4.3:
 
 * Add in full parser, to address issue #324.
 * Add in input option 'align'.
@@ -24,8 +24,6 @@ DONE:
 * Add in option 'compact' to input "Show the validation" parameter.
 * Add in a basic question use report page, linked from the question testing page.
 
-## Other things to fix
-
 ## Version 4.4
 
 ## For "inputs 2"?

stack/maxima/stackmaxima.mac

@@ -2985,4 +2985,4 @@ load(linearalgebra);
 
 /* Stack expects some output with the version number the output happens at */
 /* maximalocal.mac after additional library loading */
-stackmaximaversion:2019121800$
+stackmaximaversion:2020012700$

version.php

@@ -24,11 +24,11 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2019121800;
+$plugin->version   = 2020012700;
 $plugin->requires  = 2018051700;
 $plugin->cron      = 0;
 $plugin->component = 'qtype_stack';
-$plugin->maturity  = MATURITY_BETA;
+$plugin->maturity  = MATURITY_RC;
 $plugin->release   = '4.3.0 for Moodle 3.5+';
 
 $plugin->dependencies = array(