Update year and tested MATLAB versions

Author: petercorke

doc/manual/robot.tex

@@ -1,6 +1,7 @@
 \documentclass[a4paper,twoside]{report}
 
-\newcommand{\rtbyear}{2018}
+%%% change the year here
+\newcommand{\rtbyear}{2020}
 
 \usepackage{times}
 \usepackage{graphicx}
@@ -623,7 +624,7 @@ \subsection{Documentation}
 
 
 \section{Compatible MATLAB versions}
-The Toolbox has been tested under R2018a and R2018bPRE.  Compatibility problems are increasingly likely the older your version of \Mlab\ is.
+The Toolbox has been tested under R2019b and R2020aPRE.  Compatibility problems are increasingly likely the older your version of \Mlab\ is.
 
 \section{Use in teaching}
 This is definitely encouraged!