Update docs/readme for the bug fix release.

Readme.md

-# STACK 4.4.3
+# STACK 4.4.4
 
 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.
 

doc/en/Developer/Development_history.md

@@ -2,6 +2,12 @@
 
 For current and future plans, see [Development track](Development_track.md) and [Future plans](Future_plans.md).
 
+## Version 4.4.4
+
+Released June 2023.
+
+This is a bug-fix release.
+
 ## Version 4.4.3
 
 Released May 2023.

doc/en/Developer/Development_track.md

@@ -3,7 +3,7 @@
 Requests for features and ideas for developing STACK are all recorded in [Future plans](Future_plans.md). The
 past development history is documented on [Development history](Development_history.md).
 
-## Version 4.4.4
+## Version 4.4.5
 
 TODO: List of long lasting issues dealt with, that might need to be notified/closed, note that some of these have connecting issues:
  #671, #420