Userguide: minor update related to Dynare stable version

(cherry picked from commit dc8a3c98)

doc/userguide/ch-inst.tex

@@ -2,7 +2,7 @@
 
 \section{Dynare versions}
 
-The current version of Dynare (4.1) runs on both \href{http://www.mathworks.com/products/matlab/}{\textbf{MATLAB}} and \href{http://www.octave.org}{\textbf{GNU Octave}}.
+Dynare runs on both \href{http://www.mathworks.com/products/matlab/}{\textbf{MATLAB}} and \href{http://www.octave.org}{\textbf{GNU Octave}}.
 
 There used to be versions of Dynare for \textbf{Scilab} and \textbf{Gauss}. Development of the Scilab version stopped after Dynare version 3.02 and that for Gauss after Dynare version 1.2.